‘Kissing bug’ sickens more in Los Angeles than Zika and few know they have it – deadly Chagas disease

This insect bites people near the lips or eyes, inserts bacteria, then about 20 years later, the victim suffers a heart attack. Olive View-UCLA Medical

March 28, 2016 |by Susan Abram | Daily News, Los Angeles

This insect bites people near the lips or eyes, inserts bacteria, then about 20 years later, the victim suffers a heart attack.  Olive View-UCLA Medical Center is working to help detect Chagas. The clinic is holding community screenings across the San Fernando Valley to find people who may be infected.

Some call it the kissing bug because it leaves a painless bite near a sleeping person’s lips.

But among health experts, including those from the federal government, the cone-headed Triatomine is no prince awakening a sleeping beauty. It’s an assassin, because it leaves behind a parasite in its love bite that can be deadly.

Photos of the dime-size insect hang inside Dr. Sheba Meymandi’s medical office as if on a wanted poster. The bug, she said, carries the Chagas disease, which can cause heart failure if left untreated.

An estimated 300,000 people across the United States may have Chagas disease, Meymandi said, and the only place in the nation where it’s treated is the clinic she oversees at Olive View-UCLA Medical Center in Sylmar. Started in 2007, the Chagas clinic has treated 200 people, but Meymandi and her team said they are ready to take on more patients.

That’s why she and her staff are working with primary physicians at the four hospitals and 19 health clinics overseen by the Los Angeles County Department of Health Services. In addition, Providence Health & Services will offer Chagas screenings at a dozen free health clinics on Sundays at churches across the San Fernando Valley for the rest of the year. An upcoming screening will be held from 1 to 5 p.m. April 3 at New Hope of the Nazarene, 15055 Oxnard St, Van Nuys, California.

“It’s very clear that we need to diagnose early and treat early before the onset of complications,” said Meymandi, a cardiologist. Ten percent of those with Chagas suffer from heart failure, one of the most expensive conditions to treat, costing $32 billion year nationwide, she said. That figure could rise to $70 billion by 2030.

Chagas disease was once considered exotic, but more is known about it now than about the Zika virus. Still, most people have no idea they have it or, once they do, lack information about where to receive treatment, Meymandi said.

The disease is most common in rural Mexico and Latin America, researchers have said, adding that it kills more people in South America than malaria.Meymandi said anyone who was born in Mexico or South America should have a blood test.

But U.S.-born residents also are infected. The insect is present in more than 20 states. At least 40 percent of raccoons tested in Griffith Park carried Chagas disease, Meymandi said.

“Most of the people we see and treat in the U.S. have had it for decades,” Meymandi said. “We have the bug here, we have the parasite here. You can definitely acquire Chagas in the United States.”

An infected insect, which hides in dwellings made from mud, adobe, straw or palm thatch, crawls out at night to feed on blood. It is called the kissing bug because it feeds on a sleeper’s face, then defecates on the wound, leaving a parasite behind.

Infection takes place when the parasite enters the body through mucous membranes or broken skin, caused when the sleeper scratches the wound, eyes or mouth, according to the federal Centers for Disease and Prevention. The parasite can lie dormant for years, then cause heart disease, and if not found and treated, death.

Symptoms can include fever, fatigue, body aches, headaches, rash, loss of appetite, diarrhea and vomiting. But sometimes there are no symptoms until decades later.

Only two drugs exist to treat Chagas disease, and neither is approved by the U.S. Federal Drug Administration yet, though both can be provided through the CDC, Meymandi said.

“It’s very simple to treat,” Meymandi said. “But the process to go get the drugs is a challenge.”

Jose Duran, a Bellflower resident, said he learned he had Chagas disease after he tried to donate blood seven months ago. He said he would have never known he had Chagas disease otherwise. He had no symptoms.

“I went to donate blood for the first time, because I heard it was good for you to donate once in a while,” he said. Then he received a phone call.

It’s not uncommon for people to learn they have Chagas disease after donating blood, Meymandi and others said. In 2006, the Red Cross isolated 21 cases of Chagas in Southern California donors. In 2007, the figure more than doubled to 46. In 2008, there were 55 cases.

The National Red Cross would not provide additional figures.

“I got scared. I was like, wow, what is this?” the 40 year old Duran said of his reaction,when he learned what he had.

As a child, Duran lived on a ranch in Querétaro, a small state in north-central Mexico. His brother also tested positive for Chagas. He doesn’t remember being bitten, he said.

Duran was referred to the Chagas clinic and, after two months of treatment, learned Thursday he was in good health.

“Most people don’t know they have this,” he said. “If they get tested, they can get well.”

#SayNOtoPESTICIDES!

 

Leading cause of death in Men is caused by Chagas Disease & Heart failure 

Chagas Disease affects approximately 20 million worldwide, killing 50,000 each year, yet is practically unknown to most in the general public in the US.

If infected, you may not even know initially you have Chagas disease. It can slowly destroy your internal organs, and if you do not die from the acute stage, can cause death in the chronic stage, 10-20 years later.

Chagas is spreading worldwide — due to lack of knowledge and indifference.

Endemic in 21 countries, with 18-20 million infected and another 120 million people at risk

25% of the population of Latin America is at risk of acquiring Chagas Disease

More than 100,000 Latin American immigrants living in the United States are chronically infected and a potential source of transmission of the disease by means of blood transfusions

The disease is lethal, especially for children, and debilitates patients for years.

Previously thought to be endemic in Mexico, South and Latin America, other areas of the world such as the US and Europe are considering testing all blood donations for the parasite, T. cruzi, for the parasite that causes the disease due to travel patterns and rural migrations of populations to urban areas. 

 Chest radiograph of a Bolivian patient with chronic Trypanosoma cruzi infection, congestive heart failure, and rhythm disturbances. Pacemaker wires can be seen in the area of the left ventricle.

Infected triatomine bugs, that transmit T.cruzi, are found in North, Central and South America. Blood banks in selected cities of the continent vary between 3.0 and 53.0% -making the prevalence of T. cruzi infected blood higher than that of Hepatitis B, C, and HIV infection

In parts of South America, Chagas’ heart disease is the leading cause of death in men less than 45 years of age.

Blood transfusions in the US should be screened for antibodies to T.Cruzi; currently U.S. blood banks do not routinely conduct this screening.  

Numerous acute and chronic cases of the disease have been reported in domestic dogs in Texas, Oklahoma, Louisiana, South Carolina and Virginia

It is not known how many dogs or humans in the US actually have the disease due to lack of testing and reporting

The disease may be transmitted by the bite of an infected triaomine, (reduviid, “kissing”, or “assassin”) bugs, or through blood transfusion or transplacentally

In Texas infection rates in kissing bugs are reported to be 17-48%, in other states infection rates may not be known due to lack of knowledge about the disease and inadequate studies with regards to sampling bugs for the disease

The kissing bugs, or carriers of this disease, could be as close as your backyard.

Posted in August 3, 2012 | by CHAGAS Disease Biology Blogspot

#SayNoToPesticides!

Deadly CHAGAS: An Emerging Infectious Disease Threat In U.S.

October 1, 2015 | by Judy Stone | Forbes

Chagas, a parasitic disease, is the latest invisible killer infection to be recognized as a growing threat here. The infection is transmitted by the Triatomine bug, known as the “kissing” bug. The bugs infect people through bites—often near the eyes or mouth—or when their infected feces are accidentally rubbed into eyes or mucous membranes. Some transmission occurs from mother to child during pregnancy. Occasionally, transmission is through contaminated food or drink.   Triatoma sanguisuga – CDC/James Gathany

Most people in the U.S. with Chagas disease probably became infected as children, living in Latin America. The infection often has few symptoms early on, but after several decades, strikes fatally, often with sudden death from heart disease. I suspect that, similar to Lyme disease, the magnitude of disease and deaths from the protozoan parasite, Trypanosoma cruzi, which causes Chagas disease, is unrecognized in the U.S.

 2014 map of blood donors testing positive for CHAGAS disease. 

In Latin America, however, up to 12 million people might be infected, with a third going on to develop life-threatening heart complications. Chagas is a major cause of congestive heart failure and cardiac deaths, with an estimated 11,000 people dying annually, according to the WHO.

There are an estimated 300,167 people with Trypanosoma cruzi infection the U.S., including 40,000 pregnant women in North America. There are 30,000-45,000 cardiomyopathy cases and 63-315 congenital infections each year. Most of the people come from Mexico, El Salvador, Guatemala, Honduras, or Argentina; Bolivia has the highest rate of Chagas in the world.

But in the U.S., we don’t often think of Chagas. Even as an infectious disease physician, I’ve never treated anyone with it, and it is not on my radar. So when a physician sees a patient who may have come to the U.S. as a child, and now has diabetes and hypertension, he or she is likely to attribute the heart disease to that and not look for infection. In fact, though, there are large pockets of undiagnosed disease. For example, a survey in Los Angeles of patients with a new diagnosis of cardiomyopathy who had lived in Latin America for at least a year, found 19% had Chagas disease, and they had a worse prognosis than those without the infection.

There are other reasons Chagas is overlooked. One is that Chagas is not a reportable disease except in four states, and Texas only began reporting in 2010. Most cases here have been detected by screening of blood donations, which has found about 1 in every 27,500 donors to be infected, according to CDC. However, a 2014 survey showed “one in every 6,500 blood donors tested positive for exposure to the parasite that causes Chagas disease.” A map of positive donations is here. While the triatome bugs are most common in the southern half of the U.S., they are actually quite widespread, as shown here.
Much bigger barriers to diagnosis are social and cultural. Many patients lack health insurance. Others are undocumented immigrants fearing deportation. Health literacy and language barriers are huge. There is a stigma associated with the diagnosis, as there is for many patients with TB, as Chagas is associated with poverty and poor living conditions. As Daisy Hernández noted in her excellent story in the Atlantic, “it’s hard, if not impossible, for moms with Chagas and no health insurance to see the doctors who would connect them to the CDC” and “patients don’t necessarily have savings in case they have adverse reactions to the medication and can’t work.”

There are pockets of Chagas in the states, including Los Angeles, the Washington metropolitan area, and the Texas border, where there are large immigrant communities from endemic areas. But I suspect that with climate change, we’ll see more Chagas in the southwest U.S., as more triatomine bugs are found further north. One recent study found more than 60% of the collected bugs carried the Trypanosome parasite, up from 40-50% in two similar studies. There are also now seven reports of Chagas infection that are clearly autochthonous, or locally acquired. University of Pennsylvania researcher Michael Levy has shown that bedbugs might be capable of transmitting Chagas, but no one has shown that they actually do. Entomologist and Wired author Gwen Pearson nicely explains why bedbugs are an unlikely vector and notes that you “far more likely to be injured by misusing pesticides to try to exterminate” them.

There’s more bad news. Treatment for Chagas is effective if given early in infection, although with significant side effects. There is no effective treatment for late stages of gastrointestinal or cardiac disease. A newly released study showed that benznidazole was no more effective than placebo in reducing cardiac complications, even though it reduced levels of parasites in the blood.

   Trypanasoma cruzi parasite in heart tissue – CDC

The two drugs available to treat Chagas, benznidazole and nifurtimox, are not yet FDA approved and are only available through the CDC under investigational protocols. Both carry significant side effects. Treatment of children with early Chagas is generally effective but, as with many drugs, treatment is hampered by lack of data on pediatric dosing and limited formulations. There is little research funding for new drug development, with less than US $1 million (0.04% of R&D funding dedicated to neglected diseases) focused on new drugs for Chagas disease, according to the Drugs for Neglected Diseases Initiative (DNDi).

Where do we go from here? The most immediate and cost-effective proposals are to increase surveillance for disease and screening of high-risk populations. Since the most effective treatment is given early in the course of infection, screening of pregnant women and children is a priority, as is education for these women and Ob-Gyn physicians.
While there is no effective treatment for advanced disease, efforts are underway to develop a vaccine against Chagas. The National School of Tropical Medicine at Baylor College of Medicine just received a boost from a $2.6 million grant from the Carlos Slim Foundation for their initiative.

Chagas, like sickle cell, highlights disparities in access to screening and early treatment for serious illnesses disproportionately affecting the poor and people of color. While a moral and ethical issue, the choices made to gut public health programs for “cost saving” will also be unnecessarily costly in the end.

#SayNoToPesticides!

Did you know Chagas disease IS fatal for most dogs? Animal Planet’s Pitbulls and Parolees gets Help when Kizzy is diagnosed with Chagas disease.

Screen Shot 2016-01-28 at 7.19.28 PM

Kizzy was Pit Bulls and Parolees rescue – diagnosed with deadly Chagas disease.

February 2, 2016 | by Nesa Nourmohammadi | Animal Planet

Kizzy was the first dog at Villalobos to be diagnosed with Chagas disease.
Saturday’s heartbreaking episode of Pit Bulls and Parolees showed us the devastating effects of Chagas disease. What originated in Latin America through the “kissing bug” has found its way into parts of the United States and the Villalobos Rescue Center dogs in Assumption Parish felt it first hand. While Kizzy wasn’t so lucky, Leo was fortunate enough to find a treatment that improved his quality of life, thanks to Dr. Kristen Kulinksi and her staff at Cypress Lake Animal Hospital.

We were lucky enough to get some time with Dr. Kristen to learn more about Chagas disease. Take a look at our Q&A with her.

Q: What is Chagas’ disease?

A: Chagas’ disease, also known as American Trypanosomiasis, is a parasitic disease caused by infection with the protozoa, Trypanosoma cruzi. This protozoal parasite lives inside the Triatoma (reduviid) bug, also know as the “kissing bug” or the “assassin bug”. The infective form of the parasite is passed in the feces of the bug. Not all kissing bugs are infected with the protozoa parasite. In Texas, it has been reported that about 50% of the kissing bugs carry the disease.

Q: How is Chagas’ disease transmitted in dogs?

A: T. Cruzi, is passed in the feces of the kissing bug, and is not transmitted through their blood sucking bite. The infected feces can enter the body through open wounds, scratches, or even the initial bite of the kissing bug. Dogs can also be infected by eating the bug, or food contaminated with the kissing bug’s infected feces. Chagas’ can also be transmitted by blood transfusions, through the placenta from an infected mother to the feti, or by handling tissue that is contaminated with the disease.

Q:  Is the Kissing Bug the only vector for the disease?

A:  Yes, there are many different Triatoma species throughout the Americas, although they are all considered “kissing bugs”. Different species may have different behaviors that make infection more or less likely. Some of the bugs in South America defecate as soon as they feed, which places the infected feces directly near the open bite wound.

Q:  Where is it common? in what countries?

A:  Chagas’ disease has been found in North, Central, and South America where the reduviid bugs live. T. Cruzi can not exist without the kissing bug as the vector. It is considered endemic in South America and Mexico in humans. Recently we have been seeing a increase in canine cases in some of the southern United States as the disease travels north through Mexico (Texas, Louisiana, and California are among the states with confirmed cases).

Q:  Who can get Chagas’ disease?

A:  Many mammals can be infected by T. Cruzi, including, but not limited to; humans, rats, dogs, raccoons, skunks.  Opossums and armadillos have also been reported to carry the disease. Wildlife can serve as an important reservoir for the disease.

Q:  Why is Chagas’ disease a problem in dogs?

A:  The initial infection with Trypanosoma Cruzi, can cause vague or even no clinical signs.  Fever, enlarged lymph nodes, and anorexia (lack of appetite) are a few of the vague symptoms seen in the acute phase.  There is also a latent phase that may last for years, where the protozoa is present in the body, but does not cause any signs of disease. The chronic infection of Chagas’ disease can cause heart disease by damaging the heart muscle and ultimately causing a heart arrhythmia and heart failure. Sudden death due to a heart arrhythmia is sometimes the only sign of the disease. To make it even more confusing, some dogs that are infected will never develop signs of the disease.

Q:  Who is at risk?

A:   Dogs that live outside and in wooded areas in sections of the country that have the kissing bug are most at risk.  People and animals who travel to areas that are endemic for the disease also are at higher risk.

Q:  Do you see Chagas’ disease often in your clinic? Is it common or rare?

A: Now that we are looking and testing more for Chagas’, we see around 2 to 3  positive cases a month.  Before I graduated from vet school, 10 years ago, I was taught that I may diagnose 1 case in my professional lifetime.  So although Chagas’ is not as common as heartworm disease in our practice (which we diagnose daily), it is definitely something I test and look for in certain cases.

Q: Is there a treatment for Chagas’?

A: There is no published proven “cure” for Chagas’ disease. There are some anti-protozoal treatments that have been used in humans, but are difficult to acquire and have had limited success in dogs. Treatment has been aimed at treating the symptoms of the disease, such as the heart failure.  Fortunately through research, there have been some experimental treatments which are promising.  I have had three canine cases so far that have proven this treatment to be successful.  This research will soon be published and available by the researcher that has discovered it.

Q: How does I know if my dog has Chagas’?

A: Testing for Chagas’ disease in dogs can be done by having your veterinarian submit a blood sample to a specialized lab for further analysis. PCR (VRL lab) and IFA Antibody tests (Texas A&M Veterinary Diagnostic Lab) are both available only through your veterinarian.

Q:  How do I prevent the disease?

A:  There is no medicine or vaccine that can prevent the disease. Prevention is more aimed at decreasing the exposure of animals and humans to the kissing bug that harbors the disease.  These bugs live in wooded areas, and are attracted to light at night.  Keeping dogs inside at night and away from wooded areas, where the bug may be hiding, can help limit exposure to the disease.  Certain insecticides can be used to treat areas that may serve as a habitat for the kissing bug.

Q: What about humans?

A:  Transmission of Trypanosoma cruzi from dog to human has NOT been reported. Although the presence of the disease in dogs, could show that the disease is present in that region, and may indicate that humans may also be exposed.

Q:  Anything else about the disease?

A:  I don’t want everyone all throughout the country to worry that their dog has Chagas’ disease. Right now the disease is emerging into the United States, but it is still a rare disease in most parts of the country.  I do see a lot of stray and rescue animals at my practice, and these dogs are more likely to have been exposed to the kissing bug through their prior living conditions.  These animals are at higher risk, which is why I have more positive cases in my hospital.

My personal goal is to have veterinarians in certain areas of the country to now have Chagas’ disease as a possible differential diagnosis for certain patients. Earlier detection of the disease will also help improve the outcome for the patient because once the heart has been damaged, the effects are permanent.  Hopefully this experimental treatment protocol will continue to be successful and this disease will not always equal a death sentence every time it is diagnosed.

My desire to help patients with this disease comes from the loss of two young dogs that were owned and loved by my personal friends. Through the frustration of losing these pets, I have learned more about this emerging disease, and now have successfully treated new patients.

Q: Is there anything you’d like to acknowledge?

A: I would also like to thank Dr. Roy Madigan of The Animal Hospital of Smithson Valley in Spring Branch, Texas for his help and for sharing his knowledge of this disease.

#SayNOtoPESTICIDES!

Dr. Oz “#Chagas is not curable and will likely kill you by means of a ‘not so’ pleasant death.”

Could You Have a Deadly Parasite and Not Even Know it?  Have you heard of the kissing bug, aka ‘love bug’?

Originally aired on 1/25/2016 | The Dr. Oz Show

Have you heard of the kissing bug? Evolutionary biologist Dan Riskin explains how this parasite got its name and how you can get Chagas disease from it. Then, Dr. Oz shares how to recognize the symptoms of a parasitic infection.

#SayNOtoPESTICIDES!

Providence & UCLA Team Up to Prevent deadly Chagas disease – the leading cause of heart failure worldwide.

Deadly Chagas disease is transmitted by the kissing bug, aka ‘love bug’ – cousin to the bedbug.

February is American Heart Month and a good time to spotlight one of the leading causes of heart failure worldwide – and one that is preventable through simple screenings.

Chagas disease, caused by the chagas bugs found in Central America and some areas of the U.S., can lie dormant in victims for decades, then manifest itself with devastating consequences.For the past eight years, Providence Health & Services has teamed with the Center of Excellence for Chagas Disease at Olive View-UCLA Medical Center in Sylmar to screen for chagas.

UCLA cardiologist Sheba Meymandi, M.D., program director, believes all migrants from Central America, from infants to age 60, should be screened for the disease, which is curable in its early stages.

“Complications of chagas are horrific,” Meymandi said. “We have a lot of patients who need heart transplants. But if you catch them before complications, you either cure them or slow the progression.”

Eight years ago, Providence adopted the prevention program as a community outreach project, providing volunteers who screen patients.

Last month, Providence contributed $20,000 to the program for outreach in the community as part of its ongoing financial support.

A recent screening coordinated by Providence volunteers resulted in blood samples from 100 people.

The disease is caused by the chagas bug, which bites humans then defecates. Scratching the bite can result in the feces entering the bloodstream, causing a disease victims unknowingly carry for decades. The sooner one discovers the disease, the better the chance of cure, or medication to prevent its escalation.

The parasite exists in our country, but living conditions and the likelihood the species behaves differently result in fewer cases of chagas disease.

This article is a news release provided by Providence Health & Services.

BedBugs reported in some of NYC’s swankiest hotels. They were always there; and it’s getting worse. More important to follow as BedBugs transmit deadly Chagas disease.

February 8, 2016 | by Leonard Greene | New York Daily News
It’s not just the fleabags and flophouses.

Bedbugs have been reported in some of the city’s swankiest hotels with a list that includes the Waldorf Astoria the Millennium Hilton and the New York Marriott Marquis.

According to the Bedbug Registry, a nationwide database of bedbug reports and complaints, bedbug sightings in New York hotels have jumped more than 44 percent between 2014 and 2015.

The Millenium Hilton at 55 Church Street in New York New York.
Google Maps Street View

The Millenium Hilton at 55 Church Street in New York New York.

The data focused on establishments that are members of the Hotel Association of New York City.

Of the 272 association members, 65 percent, or 176 members, have had a guest file at least one complaint about bedbugs at the property.

NR

Michelle Bennett/Getty Images/Lonely Planet Image

Taxi cabs outside Waldorf Astoria Hotel.

Eighteen hotels had a combined 363 complaints, representing 42 percent of all bedbug complaints.

“I stayed in room 2306 for one night,” a Millennium Hilton guest wrote in a complaint to the hotel in 2014. “I found blood on my sheets and a live bug on my bed. I ended up with 60 plus bites.”

At the Times Square Doubletree guest said a stay there last year left hundreds of bite marks on the face, neck arms and hands.

“Extreme case of bed bug attacked on my entire upper body,” the guest wrote.” Went home to Florida a day early and ended up in my local emergency room.”

Research Entomologist Jeffrey White shows off some bedbugs at a informational bedbug conference at 201 Mulberry Street in Manhattan Wednesday.

Warga, Craig/New York Daily News

Last month, a California couple posted a YouTube video about their $400-a-night Central Park hotel room nightmare. The couple found dozens of bedbugs beneath their mattress at the Astor on the Park Hotel.

Lisa Linden, a spokeswoman for the hotel association, said hotels in New York are addressing the issue.

“Bedbugs are a global issue that extend beyond hotels,” Linden said.

”Every member of the Hotel Association of NYC that we are aware of has an active anti-bedbug program in place. If a problem arises, it is dealt with immediately and effectively.”

Scientists who recently studied the bloodsucking creatures in the city’s subway system discovered a genetic diversity among bedbugs depending upon the neighborhood where they were found.

They said the discovery could lead to better insecticides.

#SayNOtoPESTICIDES!

Messing with BedBugs’ Genes Could Carry Other Risks?

Bed Bugs Will Outlive All Of Us Unless We Screw With Their Genes

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photo:  Bluejake/Sara Bibi/Gothamist

Bed bugs, like cockroaches and new seasons of The Bachelor, seem impossible to eradicate from the face of the Earth, no matter how many exterminators our landlords call to spray that one time and then never, ever again. But Science says there’s some small hope for the extinction of a moviegoer’s biggest fear—screwing with their genome.

Scientists have managed to map the genome of the common bed bug, revealing some fun things about the little suckers. For instance, bed bugs are actually able to break down toxins, like the ones an exterminator might use, to render them harmless, allowing them to survive even when you try to whack them with bug killer. They’ve also been MUTATING, producing genes that make them resistant to certain insecticides and making it all the more difficult to eradicate an infestation. Another fun fact is that bugs’ genes vary from location to location—a Brooklyn bed bug will have a different genetic sequence from a Queens bed bug, though both are equally disgusting.

Bed bugs also inbreed, and their sex is quite violent. This violent sex has been well-documented, and for those of you who have not yet seen Isabella Rossellini’s bed bug porno, you’re welcome, and sorry:

The takeaway here is that bed bugs have been able to hold us hostage for a long time, but scientists might be able to murder them, provided they make a few genetic tweaks. First, though, let’s kill all the mosquitoes.

[A. Steiner:  So…..Messing with Genes Could Carry Other Risks – YES!]

#SayNOtoPESTICIDES!

Genome of BedBug shows close relationships to Kissing Bug, one of several vectors for deadly Chagas disease, and the body louse. Both have tight associations with humans.

February 2, 2016 | News from Weill Cornell Medical College

Researchers Sequence First Bedbug Genome.  Scientists have assembled the first complete genome of one of humanity’s oldest and least-loved companions: the bedbug. The new work, led by researchers at the American Museum of Natural History and Weill Cornell Medicine, and published Feb. 2 in Nature Communications, could help combat pesticide resistance in the unwelcome parasite. The data also provides a rich genetic resource for mapping bedbug activity in human hosts and in cities, including subways.

male and female bedbugs – both fed and unfed – comparison with apple seeds

“Bedbugs are one of New York City’s most iconic living fossils, along with cockroaches, meaning that their outward appearance has hardly changed throughout their long lineage,” said one of the paper’s corresponding authors Dr. George Amato, director of the museum’s Sackler Institute for Comparative Genomics. “But despite their static look, we know that they continue to evolve, mostly in ways that make it harder for humans to dissociate with them. This work gives us the genetic basis to explore the bedbug’s basic biology and its adaptation to dense human environments.”

The common bedbug (Cimex lectularius) has been coupled with humans for thousands of years. This species is found in temperate regions and prefers to feed on human blood. In recent decades, the prevalence of heated homes and global air travel has accelerated infestations in urban areas, where bedbugs have constant access to blood meals and opportunities to migrate to new hosts. A resurgence in bedbug infestations since the late 1990s is largely associated with the evolution of the insects’ resistance to known pesticides, many of which are not suitable for indoor application.

“Bedbugs all but vanished from human lives in the 1940s because of the widespread use of DDT, but unfortunately, overuse contributed to resistance issues quite soon after that in bedbugs and other insect pests,” said Louis Sorkin, an author on the paper and a senior scientific assistant in the Museum’s Division of Invertebrate Zoology. “Today, a very high percentage of bedbugs have genetic mutations that make them resistant to the insecticides that were commonly used to battle these urban pests. This makes the control of bedbugs extremely labor intensive.”

The researchers extracted DNA and RNA from preserved and living collections, including samples from a population that was first collected in 1973 and has been maintained by museum staff members since then. RNA was sampled from males and females representing each of the bug’s six life stages, before and after blood meals, in order to paint a full picture of the bedbug genome.

When compared with 20 other arthropod genomes, the genome of the common bedbug shows close relationships to the kissing bug (Rhodnius prolixus), one of several vectors for Chagas disease, and the body louse (Pediculus humanus), which both have tight associations with humans.

Click here to read complete article.

 

SayNOtoPESTICIDES!