Viral Infections: Symptoms, Causes, and Safety
What Are Viral Infections? Viral infections are illnesses caused by viruses, microscopic pathogens that invade living cells. Unlike bacteria, viruses must have a host to replicate and spread. Viruses can impact different body systems. This can lead to illnesses ranging from the common cold to serious diseases. These include influenza, hepatitis, and viral pneumonia. Viruses …