Bed bugs (Cimex lectularius) are small, parasitic insects that feed on the blood of warm-blooded animals, particularly humans.

These tiny pests have plagued humans for thousands of years, and their biology has allowed them to adapt to life in close quarters with their hosts.

Despite their small size, bed bugs are highly resilient and can survive in various environments. Understanding their biology is essential for effective control and eradication.

Nocturnal Feeders:

Bed bugs are primarily nocturnal, preferring to feed on their hosts at night. However, if a bed bug is hungry and a host is nearby during the day, it may come out of hiding to feed.

Finding Hosts:

Bed bugs are attracted to the carbon dioxide, body heat, and chemical cues emitted by their hosts. Once they locate a host, they insert their mouthparts into the skin to feed.

Feeding Process:

• Duration:  Feeding can take anywhere from 3 to 10 minutes, depending on the bed bug’s life stage.
• Frequency:  Bed bugs typically feed every 3 to 7 days, although they can survive for extended periods without feeding if necessary.
• Saliva:  Their saliva contains anticoagulants to prevent blood clotting and anesthetics to reduce the host’s awareness of being bitten.

Bed Bug Bite Effects:

Although bed bugs do not transmit diseases, their bites can cause itching, irritation, and allergic reactions in some individuals. Multiple bites are often arranged in a linear pattern or clusters, as bed bugs may take several bites before during a good feeding. If you’re getting bug bites and aren’t sure whether they’re from bed bugs or other insects, try using the Bug Bite Tracker worksheet to help you figure it out.

Hitchhiking:

Bed bugs are expert hitchhikers, often spreading by hiding themselves in clothing, luggage, furniture, or other personal items. This is why bed bug infestations are commonly associated with high-traffic areas such as hotel rooms, apartments, and public transportation.

A bed bug is unlikely to hitchhike on your body, in your hair, or on your clothes. They do not attach themselves to you like fleas or lice and do not transfer from one human to another. They typically climb into a bag or suitcase that will provide a good hiding spot.

Infestation Dynamics:

Infestations typically begin when a group of bed bugs are introduced to new areas. If a single adult male is introduced to your home, it cannot breed and will not grow into an infestation. When a single pregnant female is introduced, it is possible it can grow into an infestation, but in most cases, its a group of bed bugs that hitchhike into your home to start the infestation.

An infestation is established once reproduction can regularly occur. If you are finding bed bugs at different life stages (adults, nymphs, and eggs), then you have an established infestation.

Bed bugs reproduce at an astounding rate. One pregnant female will lay up to 7 eggs per week and up to 113 eggs in her lifetime. Those eggs will hatch and grow into adult bed bugs in 3-5 weeks and can then start reproducing. Once established and without limiting factors, the population will grow exponentially and double every 16 days.

In recent years, bed bugs have developed resistance to many common insecticides, including pyrethroids, which were once the primary means of control. Their resistance is attributed to genetic mutations that enhance their ability to detoxify chemicals or reduce the penetration of toxins through their exoskeletons.

Bed bugs cannot develop resistance to heat. Like all living organisms, bed bugs have a specific range of temperatures within which their bodies can function. Their cellular structures and proteins are optimized for survival within a certain temperature range, typically between 70°F and 90°F (21°C to 32°C). When exposed to temperatures above 113°F (45°C) for an extended period, the proteins in their bodies begin to denature, and essential biological processes break down, leading to their death.