Chronic oxidant exposure and epidemic influenza.
D000041:Absenteeism; D000397:Air Pollution; D000704:Analysis of Variance; D002140:California; D002648:Child; D004196:Disease Outbreaks; D004781:Environmental Exposure; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007251:Influenza, Human / Q000175:diagnosis / Q000453:epidemiology*; D009017:Morbidity; D012572:School Health Services; D011795:Surveys and Questionnaires; D014505:Urban Population