Authors: Silfverdal, SA; Ehlin, A; Montgomery, SM

Source: Acta Pædiatrica, Volume 98, Number 4, April 2009 , pp. 715-719(5)

Publisher: Wiley-Blackwell

Abstract:

Background: Breast-feeding protects against many infectious diseases and may also influence immunization outcomes.

Aim: This study investigated if breast-feeding protects against clinical measles and if it modified the effect of immunization.

Methods: We used logistic regression with data for 10 207 individuals from the 1970 British Cohort study (BCS70). Breast-feeding data were collected at five years of age, and information on clinical measles infection, as well as socio-economic measures was collected at the age of ten years. Breast feeding was categorized as: breast-fed <1 month (n = 1611), breast-fed for 1-3 months (n = 1016), breast-fed for more than three months (n = 1108), breast-feeding of uncertain duration (n = 21) and never breast-fed (n = 6451).

Results: Breast-feeding for more than three months was negatively associated with a diagnosis of clinical measles infection after adjustment for crowding, social class, measles vaccination, parity and sex with an odds ratio (95% confidence interval) of 0.69 (0.60-0.81) compared with those who never breast-fed. Measles vaccination was highly associated with low risk for measles with: 0.14 (0.13-0.16). Age at acute measles infection was not associated with breastfeeding. Breast-feeding did not notably alter measles immunization efficacy.

Conclusion: Immunization against measles provides effective protection against the disease. A more modest reduction in the risk of a measles diagnosis is associated with breast-feeding. The associations with a diagnosis of measles for breast-feeding and measles immunization are independent of each other.

Keywords: Breast feeding; Cohort study; Measles; Measles vaccine; Protection

Document Type: Regular article

DOI: http://dx.doi.org/10.1111/j.1651-2227.2008.01180.x

Affiliations: 1: Department of Medicine, Clinical Epidemiology Unit, Karolinska Hospital, Karolinska Institutet, Sweden

Publication date: 2009-04-01

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