JOHN E. WALKER, M.D.
There is a growing conviction that colds are due to a specific filtrable virus. This conclusion is of such importance that the evidence leading up to it needs to be examined critically. The evidence in favor of the view is two-fold. First, experiments have been reported which appear to show that colds can be transmitted to humans and to chimpanzees by bacteria-free filtrates of nasopharyngeal secretion obtained from persons suffering from colds. Secondly, it is supposed that there is sufficient evidence to show that ordinary bacteria, while admitted to be pathogenic, are in no way concerned in the primary etiology
WALKER JE. The Etiology of Colds1. Ann Intern Med. ;5:1526–1531. doi: 10.7326/0003-4819-5-12-1526
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Published: Ann Intern Med. 1932;5(12):1526-1531.
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