A child in California caught bird flu amid a recall of raw milk in the state, but investigations have found no evidence that the case was caused by raw milk.
Viral infection is the invasion of the body by a small agent known as a virus. Viruses replicate inside host cells and can produce toxins that cause disease. The immune system helps to destroy ...
Sinus infections themselves aren’t contagious, but the viruses that cause most of them are. Viral sinus infections often follow colds or flu, which spread through respiratory droplets when someone ...