The common cold.

By C. Ellenbogen. 1981

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The economic burden of non-influenza-related viral respiratory tract infection in the United States. (2003, background): “Non–influenza-related VRTI has typically been perceived as a self-limiting condition with little or no economic impact on society and the health care system.(21,40) However, our findings suggest that the resultant clinical and cost ramifications attributable to this common condition impose a signifi”
Identification of a Novel Polyomavirus from Patients with Acute Respiratory Tract Infections (2007, background): “Despite extensive studies in the past decades that have identified a number of etiologic agents, including rhinoviruses, coronaviruses, influenzaviruses, parainfluenzaviruses, respiratory syncytial virus, and adenoviruses, approximately 30% of all cases cannot be attributed to these agents, suggesti”
Epidemic influenza and vitamin D (2006, background): “pointed out, people also congregate indoors during the summer [102].”
Association Between Serum 25-Hydroxyvitamin D Level and Upper Respiratory Tract Infection in the Third National Health and Nutrition Examination Survey (2009, unknown): “Total 18 883 195 19 (18-20) Serum 25(OH)D, ng/mL 10 684 4 (3-4) 24 (20-29) .”