Strain - A genetic variant or specific subtype of a microorganism, such as a virus or bacteria.⏎
Zoonoses - Any disease that can be transmitted from vertebrate animals to humans.⏎
Tissue Culture - The process by which tissues are intentionally grown under controlled conditions.⏎
Species - One of the most basic units of biological classification, ranking just below the genus and comprising individuals or populations capable of interbreeding.⏎