title: 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.
abstract: 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.
authors.affiliation: World Health Organization, Geneva, Switzerland. Lorenzo.pezz@gmail.com
authors.forename: L
authors.initials: L
authors.lastname: Pezzoli
authors.forename: R
authors.initials: R
authors.lastname: Tchio
authors.forename: A D
authors.initials: AD
authors.lastname: Dzossa
authors.forename: S
authors.initials: S
authors.lastname: Ndjomo
authors.forename: A
authors.initials: A
authors.lastname: Takeu
authors.forename: B
authors.initials: B
authors.lastname: Anya
authors.forename: J
authors.initials: J
authors.lastname: Ticha
authors.forename: O
authors.initials: O
authors.lastname: Ronveaux
authors.forename: R F
authors.initials: RF
authors.lastname: Lewis
mesh_terms: D002163:Cameroon / Q000453:epidemiology; D016000:Cluster Analysis; D006801:Humans; D007407:Interviews as Topic; D055810:Lot Quality Assurance Sampling; D032541:Mass Vaccination / Q000379:methods / Q000592:standards / Q000706:statistics & numerical data*; D011051:Poliomyelitis / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage* / Q000592:standards; D012372:ROC Curve; D015004:Yellow Fever / Q000517:prevention & control*; D022341:Yellow Fever Vaccine / Q000008:administration & dosage* / Q000592:standards
chemical_list: D011055:Poliovirus Vaccine, Oral; D022341:Yellow Fever Vaccine