title: Epidemiological Investigation of a Typhoid Outbreak.
abstract: BACKGROUND
  An outbreak of typhoid fever among school children of a school in military station in central India is reported here. It comprises of 98 students out of which 87 students were from one school.
  
  
  METHODS
  Detailed epidemiological case sheets were filled for cases and active case finding surveys were conducted among the school students during the period of study. It included 3313 students of the affected school.
  
  
  RESULTS
  Attack rate of the affected school was 2.62 percent (RR 13.38, 99% CI of RR 10.8, 16.12). Blood samples were found to have Salmonella typhi in 5.43%. Eighty six blood samples (87.75%) were positive for Widal test. Sanitary survey revealed fecal contamination of water supply leading to the outbreak.
  
  
  CONCLUSIONS
  We recommend having a sound vaccination programme for children, adequate chlorination of water supply and formation of local groups at school level to monitor water quality on a daily basis.
authors.affiliation: Officer Commanding, Station Health Organisation (Large), 900349, C/o 99 APO.
authors.forename: B S
authors.initials: BS
authors.lastname: Dhadwal
authors.affiliation: DADH, HQ 27 Mtn Div, 908427, C/o 99 APO.
authors.forename: R A
authors.initials: RA
authors.lastname: Shetty
keywords: Epidemiological investigation; Typhoid fever