Question

A) Vaccines almost always induce antibody. Discuss 3 protective function of antibodies against a viral infection( ow do antibodies protect us from foreign pathogens

B) List and explain 4 strategies used by viruses to evade the host immune response. Indicate if it is eveding the innate or adaptive immune or both

Answer 1

Question A)

Antibodies block infection by virus by a process called neutralization. The three protective  functions of antibodies against a viral infections are as:

1. Many enveloped viruses are lysed when antiviral antibodies and serum complement disrupt membranes of the virus. This appears to be the most common mechanism by which antibodies and complement neutralize viruses. Examples viruses neutrilized by lysis Poxviridae, Retroviridae,etc.
2. Antibodies may interfere with virion binding to receptors thus block uptake into cells. Example is Hepatitis B virus.

3. By causing aggregation of virus particles.Many antibodies can work together, causing virus particles to stick together in a process called agglutination. Agglutinated viruses make an easier target for immune cells than single viral particles.

The  srategies used by viruses to evade the host immune response are as: