The pathogenicity of a virus depends upon:(a) The immunity of the host body(b) The effective penetration of its genome(c) The overall environment inside the body(d) The overall environment outside the body

The pathogenicity of a virus depends on several factors:

(a) The immunity of the host body: A strong immune system can often fight off a virus before it causes illness. If the host body has a weak immune system, the virus is more likely to cause disease.

(b) The effective penetration of its genome: For a virus to cause disease, it must be able to penetrate the host cell and insert its genetic material. If it can do this effectively, it is more likely to be pathogenic.

(c) The overall environment inside the body: Certain conditions within the body can make it easier or harder for a virus to cause disease. For example, if the body is already weakened by another illness, it may be easier for the virus to cause disease.

(d) The overall environment outside the body: This can also affect a virus's pathogenicity. For example, certain environmental conditions can make it easier for a virus to spread from person to person. However, this factor is less directly related to the pathogenicity of the virus itself, and more to its ability to spread and cause disease in a population.