All of the following are factors in upper respiratory diseases except
allergens.
lowered body temperature.
viruses.
bacteria.
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https://elitetutorshelp.com/wp-content/uploads/2020/01/logo-300x60.png00adminhttps://elitetutorshelp.com/wp-content/uploads/2020/01/logo-300x60.pngadmin2018-05-03 14:04:362018-05-03 14:04:36All of the following are factors in upper respiratory diseases except?