Risk Factors for Pertussis Among Hispanic Infants – Metropolitan Portland, Oregon, 2010-2012.

In 2012, Oregon observed its highest numbers of reported pertussis cases since 1953. The greatest morbidity occurred among infants <6 months of age, with higher rates among Hispanics than non-Hispanics. To explain this disparity, we analyzed pertussis surveillance data.
METHODS:
An analysis was conducted among infants 4 or ≤4 persons), pertussis vaccination status (up-to-date or not up-to-date for age), child care center attendance (yes or no), infant birth weight (<2,500 or ≥2,500 g), and maternal age (<20 or ≥20 years).
RESULTS:
Eighty-two infants 4 persons. Univariate analysis showed Hispanic infants had ~2.3 times the risk for pertussis, compared with non-Hispanic infants, and infants living in households >4 persons had ~2.4 times the risk for illness, compared with those in households with ≤4 persons; stratified risk ratios did not differ between Hispanic (2.4 [confidence interval {CI}: 1.0-5.7]) and non-Hispanic infants (2.0 [CI: 1.2-3.5]).
CONCLUSIONS:
A household size of >4 persons is a potential risk factor for pertussis; the magnitude of this risk is similar for Hispanic and non-Hispanic infants.

Authors:Levri KM1, Reynolds L, Liko J, Dott M, Robinson BF, Cieslak PR.
Journal:Pediatr Infect Dis J. 2016
Link:http://www.ncbi.nlm.nih.gov/pubmed/26766145