Question

question 10 of 10
which makes viral infections difficult to defeat?
a. viruses live outside of cells.
b. the immune system must attack the bodys own cells.
c. viruses are attacked by a nonspecific immune response.
d. macrophages work slowly.

Explanation:

Viruses are intracellular pathogens. They invade and replicate inside the body's cells. To eliminate them, the immune system has to target the infected host - cells, which is challenging as it means attacking the body's own cells. Viruses do not live outside of cells (they are obligate intracellular parasites), the immune - response to them is often specific, and the speed of macrophages is not the main factor in the difficulty of defeating viral infections.

Answer:

B. The immune system must attack the body's own cells.