Question

What is antigenic shift?

O The molecular mechanism that allows antigens to "hide" from the human host's
immune system
O The phenomenon of viruses and bacteria mutating so that vaccines and antibiotics are
obsolete
O When two or more known strains of a virus combine to form a new strain
O I'll answer after I dunk my iPad in disinfectant

Answer 1

B- The phenomenon of viruses and bacteria mutating so that vaccines and antibiotics are obsolete.

Step-by-step explanation:

Antigenic shift has been studied most extensively in influenza type A viruses, which experience this change about once every 10 years.