How Bed Bugs Outsmart Poisons

In the first study to explain recent failure to control bedbugs, toxicologists show how some bugs have developed resistance to pyrethroid neurotoxins.

Bed bugs are on the comeback trail. They were nearly eradicated in the built environment but in urban centers such as New York City their presence is becoming increasingly evident. Toxicologists at the University of Massachusetts Amherst and Korea’s Seoul National University have conducted the first study to explain the failure to control certain bed bug populations. the study shows some of these nocturnal blood suckers have developed resistance to pyrethroid insecticides, in particular deltamethrin, that attack their nervous systems. The study by senior researcher John Clark and colleagues in the current issue of the Journal of Medical Entomology reveals these pests have evolved to outsmart the latest generation of chemicals used to control them since DDT was banned. The researchers summarize that diagnostic tools to detect the relevant mutation in bed bug populations have been “urgently needed for effective control and resistance management.” the team found bed bugs in New York City have acquired mutations in their nerve cells, which blunt the neurotoxic effect of the pyrethroid toxins used against them. The mutations affect sodium channels (resembling pores) in the neurons’ outer membrane, where electrical nerve impulses are produced. In the past, these nervous system poisons could effectively paralyze and kill the bugs, but this is no longer always the case. Resistance means mutations are acquired over time by selection with pyrethroids, so the neuronal pores no longer respond to their toxic effects. The researchers discovered these pores in New York City bed bugs are now as much as 264 times more resistant to deltamethrin. This means that even if treated, New York City bed bugs go on to suck blood from unsuspecting sleepers for many more nights. The researchers do not know how widely this resistance has spread, that is, whether the bugs that infest hotels, apartment buildings and homes in places other than New York City have developed the same type of immunity to chemical control. Clark said, “This type of pyrethroid resistance is common in many pest insects and the failure of the pyrethroids to control bed bug populations across the United States and elsewhere indicates that resistance is already widespread.” The researchers collected hard-to-control bed bugs from New York City, plus easy-to-control bed bugs from an untreated colony in Florida, Clark explains. The New York population was determined to be highly resistant (264 times more resistant) to deltamethrin compared to the Florida population by contact exposure. The team also found resistance was not due to the increased breakdown of deltamethrin (enzymatic metabolism) by the resistant bed bugs but appeared to be due to an insensitive nervous system. The team used molecular techniques to sequence genes related to the sodium ion channel’s operation in both groups and identified two mutations found only in the resistant population. Similar mutations have been found in other pyrethroid-resistant insects and are likely the cause of the resistance in bed bugs, Clark and colleagues note. This helps to narrow the focus of the next set of experiments designed to reveal more about the acquired resistance. There are several kinds of bed bugs but the one best adapted to the human environment is known in Latin as Cimex (“a bug”) lectularius (“lying down at home”), which shows how long they’ve been with us. Bed bugs arrived here with the earliest European visitors. Bedbugs feed about once every five to 10 days but are not thought to spread disease. They use two tubes, one to inject an anticoagulant and mild anesthetic, the other to suck blood.