The<unk>  is the most<unk>  human disease and affects people all over the globe. Adults typically have two to three infections annually, and children may have six to ten<unk> s a year (and up to twelve<unk> s a year for school children). Rates of symptomatic infections increase in the elderly due to declining immunity. Native Americans and Inuit are more likely to be infected with<unk> s and develop complications such as otitis media than Caucasians. This may be explained as much by issues such as poverty and overcrowding as by ethnicity.
Common cold
Whooping cough
Pontiac fever
Allergic rhinitis
Polymer fume fever
Sinusitis
Plague 
Bronchitis