Read the excerpt from the supporting text "Disease Central" in When Birds Get Flu by John DiConsiglio.
In 1958, scientists at the CDC made their first trip overseas. A team went to Southeast Asia to respond to an epidemic of
smallpox and cholera.
The author uses this passage to help the reader focus on
why Dr. Dowell is in Thailand.
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why epidemics are dangerous
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why scientists work for the CDC.
why the CDC was formed.

The author uses this passage to help the reader focus on why Dr. Dowell is in Thailand.

Explanation:

In the supporting text "Disease Central" in John DiConsiglio's When Birds Get Flu, the author included details on the reason why Dr. Dowell had to go to Thailand. The scientists’ first trip overseas to Southeast Asia is to work on the "epidemic of smallpox and cholera" that has taken over the people.

This passage is included so that the readers will understand why Dr. Dowell had to be there in Thailand. It also allows the writer to provide a background on why the scientists and other experts had to make an overseas trip. It also tells us why a US-based doctor from the CDC had to come to another side of the world.

the answer is "the man who came here yesterday was selling magazines."