Do bed bugs spread diseases?

There have been no known cases of bed bugs passing disease from host to host. Extensive testing has been carried out in laboratory settings that conclude that bed bugs are unlikely to pass disease from one person to another.
However recent studies have found numerous traces of human disease in bed bugs, including viruses and bacteria. None of these reproduce or multiply within bed bugs, and very few survive for a long time inside a bed bug. Laboratory studies of bed bugs have discovered that bed bugs may harbour HIV in their digestive tracts, but the virus is not present in bed bug faces and doesn't survive for long periods. Attempts to transmit disease in the laboratories using bed bugs have proven to be unsuccessful.
There is no evidence that bed bug can transmission any disease, including hepatitis B virus and HIV.
The main medical risk of bed bugs is associated with their bites, the effect of bed bug bites varies among people. Bedbugs require regular blood feeds in order to reproduce and complete their life cycle. When feeding, bed bugs inject saliva in to the host that contains a chemical anaesthetic, so the bites themselves are not painful and the blood sucking is pain free. The chemical injection also carries an anticoagulant to stop clotting this chemical can cause an unpleasant reactions. The most common reaction is itching and a reddish wheal cause by the bites at the feeding place. Allergic reactions to bed bug bites can occur in some people.
People living with bad bed bug infestations will subject their hosts to nightly feedings routines which often lead to restless nights, sleep depredation, and stress. This is particularly bad where children are involved.