Introduction: Viral Infections: Merck Manual Home Edition A virus is a small infectious organism?much smaller than a fungus or bacterium?that must invade a living cell to reproduce (replicate). The virus attaches to a cell (called the ... Bacterial infection vs. viral infection: What's the difference ... The differences between bacterial infections and viral infections are important. ... What's the difference between a bacterial infection and a viral infection? MedlinePlus: Viral InfectionsArticles and links on viral infections from the United States National Library of Medicine. Infection - Wikipedia, the free encyclopediaAn infection is the detrimental colonization of a host organism by a foreign species. In an infection, the infecting organism seeks to utilize the host's resources to multiply ... Viral Skin InfectionsDetailed information on viral skin infections, including Herpes Zoster (Shingles), Pityriasis Rosea, Warts, and Molluscum Contagiosum |