Epidemiological investigation of a varicella cluster in a middle school
This paper investigates a cluster of varicella outbreaks in a middle school and analyzes its causes and characteristics.The incidence rate of this outbreak was 0.78％(21/2 700),all of which were mild and uncomplicated.Among the 21 cases,4 people received 2 doses of live attenuated varicella vaccine and 5 people received 1 dose.There were 9 break-through cases,accounting for 42.86％,and the remaining 12 cases had no immunization history of varicella vaccine,account-ing for 57.14％.Varicella is easy to gather or epidemic in schools,so timely morning and noon inspections should be carried out to detect cases as soon as possible,and effective prevention and control measures should be taken in time to control the spread of the epidemic.
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