EVERYDAY SCIENCE

Detailed explanation-1: -Viruses that infect the skin are spread through skin-to-skin contact, and respiratory viruses are shed within respiratory secretions, passed along through a cough or sneeze to a new, susceptible host.

Detailed explanation-2: -The different phases in infections include: Infective period. Communicability period. Incubation period.

Detailed explanation-3: -In direct transmission, an infectious agent is transferred from a reservoir to a susceptible host by direct contact or droplet spread. Direct contact occurs through skin-to-skin contact, kissing, and sexual intercourse. Direct contact also refers to contact with soil or vegetation harboring infectious organisms.

Detailed explanation-4: -Attachment. A virus attaches to a specific receptor site on the host cell membrane through attachment proteins in the capsid or via glycoproteins embedded in the viral envelope. The specificity of this interaction determines the host-and the cells within the host-that can be infected by a particular virus.