I, II and III

III and VI

II, IV and V

I, III and VI

There is a higher rate of mutation in flu virus antigens than in tetanus bacteria, so you need to change the antibodies you are producing (through vaccination) every year for the flu.

Infections that enter the body through the bloodstream (like tetanus) are much less toxic than infections that enter the body through binding to epithelial cells (like the flu).

The flu is everywhere but bacterial infections are incredibly rare, so you don’t need to be as careful in maintaining your immunity against them.

Antibody production against viruses drops off about 10 times faster than antibody production against bacterial infections, so you need to be vaccinated 10 times more frequently against the flu.

III and IV are correct

I and IV are correct

I and V are correct

II is correct

I, III and V are part of the innate immune system

I, II and III are part of the innate immune system

II, IV and VI are part of the innate immune system

V, VI and VII are part of the innate immune system

Flagellin

Mannan

Double stranded RNA

Capsid proteins

When an antigen is presented to a B cell, the B cell takes up the antigen and chemically modifies it in the form of an antibody, prior to rapid cellular division of the specific B cell.

A large pool of B cells exist, all of which have the same base structure of an antibody on its surface, which are rapidly modified to upon exposure to an antigen

A large pool of B cells exist, all with a different antigen recognition site. Rapid division of a particular B cell is activated once an antigen binds to a specific antibody on a B cell

When an antigen binds to a generic antibody, the structure of the antibody rapidly changes to ensure a good fit, which is followed by rapid cellular division of the specific B cell