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Clustered lot quality assurance sampling: a tool to monitor immunization coverage rapidly during a national yellow fever and polio vaccination campaign in Cameroon, May 2009

  • L. PEZZOLI (a1), R. TCHIO (a2), A. D. DZOSSA (a3), S. NDJOMO (a3), A. TAKEU (a3), B. ANYA (a4), J. TICHA (a4), O. RONVEAUX (a5) and R. F. LEWIS (a6)
  • DOI:
  • Published online: 22 March 2011

We used the clustered lot quality assurance sampling (clustered-LQAS) technique to identify districts with low immunization coverage and guide mop-up actions during the last 4 days of a combined oral polio vaccine (OPV) and yellow fever (YF) vaccination campaign conducted in Cameroon in May 2009. We monitored 17 pre-selected districts at risk for low coverage. We designed LQAS plans to reject districts with YF vaccination coverage <90% and with OPV coverage <95%. In each lot the sample size was 50 (five clusters of 10) with decision values of 3 for assessing OPV and 7 for YF coverage. We ‘rejected’ 10 districts for low YF coverage and 14 for low OPV coverage. Hence we recommended a 2-day extension of the campaign. Clustered-LQAS proved to be useful in guiding the campaign vaccination strategy before the completion of the operations.

Corresponding author
*Author for correspondence: Dr L. Pezzoli, Epidemiology Consultant, World Health Organization, Geneva, Switzerland. (Email:
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Epidemiology & Infection
  • ISSN: 0950-2688
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