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Unformatted text preview: may contain neutralizing factors as well. EPIDEMIOLOGY: Parainfluenza: Found worldwide, Parainfluenza affects mostly children. The virus is endemic in some areas and epidemic at times. The source for infections is the respiratory tract of humans. Disease is contagious for 3-16 days, transmission is person to person or by droplets. At 5 years of age, about 90-100% have antibodies against type 3, about 74% for type 1 and about 58% for type 2....
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- Fall '10