An individual recovers from the common cold, which is caused by rhinovirus A. The erson then becomes infected with the avian influenza virus, which causes the bird flu. Which statement best describes what will most likely happen to this person?

(1) He will have the symptoms of the bird flu because he is not immune to the avian influenza virus.

(2) He will have the symptoms of the common cold because he is not immune to the avian influenza virus.

(3) He will not have the symptoms of the bird flu because he is immune to rhinovirus A.

(4) He will not have the symptoms of the common cold because the avian influenza virus causes it.

The correct answer is (1) He will have the symptoms of the bird flu because he is not immune to the avian influenza virus.

Explanation:

Rhinovirus A and avian influenza virus are the two different viruses having different genetic makeup. So when an individual got common cold his body gets immune to the rhinovirus A therefore when this virus with same surface antigen comes again then the immune cells will eliminate it quickly.

As the avian influenza virus is a genetically different virus, therefore, the individual immune system has no memory against it therefore when the individual becomes infected with the avian influenza virus then bird flu symptoms will be seen in the individual. So the right answer is 1.