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In a comparison of acute respiratory disease patterns and incidence in students in a semi-tropical climate at the University of the Philippines with those in students in a temperate climate at the University of Wisconsin, USA, it was found that, while respiratory infections were the commonest cause of infirmary admissions in both institutions, yet, contrary to expectations, their incidence and relative importance were actually greater in the Philippine students than in the Wisconsin students. Peak rates occurred during the rainy season in the Philippines and during the coldest months in Wisconsin. Acute infectious mononucleosis was absent in the Philippines and streptococcal sore throat and primary atypical pneumonia were rare, but the three conditions were common in Wisconsin. The authors suggest that this difference in clinical pattern may be due to immunity in the Philippines students as a result of prior childhood infection.
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