infections
Overview of Viral Infections
Spread of viruses
Viruses are spread (transmitted) in various ways. They may be Swallowed Inhaled Spread by the bites of insects, such as mosquitoes, certain biting flies, or ticks Spread sexually (in Overview of Sexually Transmitted Infections (STIs) ) Spread during transfusion of contaminated blood Spread congenitally during pregnancy New human viruses sometimes develop from viruses that usually affect animals (for example, Severe Acute Respiratory Syndrome (SARS) and Many viruses that were once present in only a few parts of the world are now spreading. These viruses include chikungunya virus, Crimean-Congo hemorrhagic fever virus, Japanese encephalitis virus, Rift Valley Fever virus, West Nile Virus Infection , Ross River virus, 