A Disproportionate Number of Viral Infections Occur in the Respiratory

Multiple Choice

A disproportionate number of viral infections occur in the respiratory and digestive systems; how might this be explained?

A) New viral particles can be easily released in feces or exhaled air.
B) The lung, stomach, and intestinal tract can be easily reached when the virus contacts a new host.
C) The immune response may be less vigorous or effective in these locations.
D) All of the above are reasonable hypotheses.