Definition
An animal virus is a virus that infects animal cells, causing a wide range of diseases, from the common cold to more severe illnesses. They're obligate intracellular parasites, relying on host cells for replication. Think of them as tiny invaders hijacking animal cell machinery. Animal viruses spread through various routes, including direct contact, airborne droplets, and vectors like mosquitoes. They exhibit diverse structures and infection strategies, leading to a vast array of symptoms. Understanding animal viruses is crucial for human and animal health.