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Pertussis outbreak in northwest Ireland, January - June 2010.Barret, A S; Ryan, A; Breslin, A; Cullen, L; Murray, A; Grogan, J; Bourke, S; Cotter, S; Health Protection Surveillance Centre (HPSC), Dublin, Ireland. email@example.com (Euro surveillance : bulletin Européen sur les maladies transmissibles = European communicable disease bulletin, 2010-09-02)We report a community pertussis outbreak that occurred in a small town located in the northwest of Ireland. Epidemiological investigations suggest that waning immunity and the absence of a booster dose during the second year of life could have contributed to the outbreak. The report also highlights the need to reinforce the surveillance of pertussis in Ireland and especially to improve the clinical and laboratory diagnosis of cases.