[An outbreak of epidemic bronchiolitis].
During January to March in 1986, there was an outbreak of epidemic bronchiolitis in Yunchen, Shanxi province. Thirteen counties and cities were involved in Yunchen. On the basis of a survey in 7 counties, there were 6070 cases, with the attack rate of 13.77%. Most patients were infants and young children. The highest attack rate was in 0-age-group (89.06%), next was in 1-age-group (55.71%). The attack rate decreased with the increase of age. The lowest attack rate was in the 10-age-group (0.53%). The attack rate in males was higher than that in females (chi 2 = 101.09, P less than 0.01), and the sex ratio (males to females) was 1.4:1. The clinical symptoms of most patients were serious. Most patients (75.7%) had symptoms of obstructive asthma. In this outbreak, the fatality rate was one percent. Family aggregation of this outbreak of epidemic bronchiolitis was found by binominal distribution method (chi 2 = 9.51 P less than 0.05). Both etiologic and serologic studies showed that the major pathogen causes this epidemic bronchiolitis was RSV. The risk factors in this outbreak were studied. It appeared that the outbreak of epidemic bronchiolitis was related to the variation of temperature: the bigger variation of daily temperature, the more the cases were found (rs = 0.4799, P less than 0.05). The occurrence of the disease was also related average space in the house each person had. The smaller the house, the higher attack rate it showed (trend chi 2 = 5.58, P less than 0.05).
Wang
G D
GD
Shanxi Medical College, Taiyuan.
D000293:Adolescent; D000914:Antibodies, Viral / Q000032:analysis; D001988:Bronchiolitis / Q000453:epidemiology* / Q000382:microbiology; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D004196:Disease Outbreaks; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D015995:Prevalence; D012136:Respiratory Syncytial Viruses / Q000276:immunology
D000914:Antibodies, Viral