PMID: 29770064Feb 2, 2017Paper

Use of a 40-day rolling incidence to monitor pertussis in Nova Scotia, 2015

Canada Communicable Disease Report = Relevé Des Maladies Transmissibles Au Canada
B BornF Atherton

Abstract

Pertussis can cause a serious respiratory bacterial infection, especially in infants. Between January 1 and December 31, 2015, there was an increase in the number of reported pertussis cases in Nova Scotia (NS). Surveillance practices for pertussis in NS were challenging because immunization coverage data are not available and rate information was neither timely nor precise with respect to geography. Public health officials in NS decided to adopt a new surveillance technique to inform public health actions across the Province. To assess the use of a 40-day rolling incidence rate to monitor pertussis activity in Nova Scotia. A 40-day rolling incidence rate was calculated for pertussis by age groups and various levels of geography. Public health authorities continued to anticipate new cases of pertussis if the contacts of known cases were still within the incubation period (range between six and 20 days). The 40-day incubation period was chosen to reflect twice the incubation period's upper range. Rates were calculated using Statistics Canada population projections for 2014 and then compared with traditional case counts and cumulative incidences. The usefulness of the statistics was assessed by public health decision makers. Incr...Continue Reading

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