Capsid

A capsid is the protein shell that surrounds and protects the genetic material of a virus. It’s made up of smaller protein units called capsomers, which assemble into a specific, often symmetrical shape. The capsid's primary role is to shield the viral DNA or RNA during transmission and aid in attaching to host cells to initiate infection. Its structure varies among different viruses but is crucial for stability and infectivity. In summary, the capsid acts as a protective container that also helps the virus infect new cells.