Explain What role did Walter Reed play in finding the cause of yellow fever?

Reed and his team systematically demonstrated that mosquitoes only picked up the yellow fever virus if they fed on a person during the first three days of infection. After a period of days of incubation, the mosquitoes could then pass on the virus to another human through a bite.

Explanation:

some people are just against it im not sure but i think everyone deserves to be treated equally i think people have a problem with it because its different and not like everything else i hope this !

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