The flu virus has the following characteristics. a. The causative microbe can also cause a membrane across the pharynx. b. This disease is difficult to treat because of the antigenic drift of its exotoxin. c. New mutations of proteins on the viral envelope cause a variety of types each year. d. A later outbreak may include skin lesions in a dermatome pattern.

The flu virus has the following characteristics this disease is difficult to treat because of the antigenic drift of its exotoxin

Explanation:

Flu is difficult to treat as a result of antigenic drift of its exotoxin

Option B.

Explanation:

Flu virus is a viral infections that affects humans and it's very deadly. It attacks the lungs, throat and nose. It spreads through airborne respiratory droplets, touching contaminated surface, saliva e.t.c.

This disease is difficult to treat because of the antigenic drift of it's exotoxin. There are some drugs that inhibit the enzymes in and out of the cells but it is short lived due to it's antigenic drift properties.

Symptoms include fever, cold, cough, catarrh e.t.c.

i think that the best answer would be c.

tell me if im wrong : )