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

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...

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Bibliographic Details
Published in:	Epidemiology and infection Vol. 140; no. 1; pp. 14 - 26
Main Authors:	PEZZOLI, L., TCHIO, R., DZOSSA, A. D., NDJOMO, S., TAKEU, A., ANYA, B., TICHA, J., RONVEAUX, O., LEWIS, R. F.
Format:	Journal Article
Language:	English
Published:	Cambridge, UK Cambridge University Press 01-01-2012
Subjects:	Arboviroses Binomial distribution Biological and medical sciences Cameroon - epidemiology Cluster Analysis Epidemiology Fever Fundamental and applied biological sciences. Psychology Human viral diseases Humans Immunization Infectious diseases Inks Interviews as Topic Lot Quality Assurance Sampling Mass Vaccination - methods Mass Vaccination - standards Mass Vaccination - statistics & numerical data Medical sciences Microbiology Oral poliovirus vaccine Polio Poliomyelitis Poliomyelitis - prevention & control Poliovirus Vaccine, Oral - administration & dosage Poliovirus Vaccine, Oral - standards Quality control Random sampling ROC Curve Sample size Simulation Tropical viral diseases Vaccination Vaccines Viral diseases Viral diseases of the nervous system Yellow fever Yellow Fever - prevention & control Yellow Fever Vaccine - administration & dosage Yellow Fever Vaccine - standards Lot Midi Pyrénées Cameroon Europe Africa Central Africa France Sub-Saharan Africa Nigeria oral polio vaccine yellow fever Vaccine Clustered lot quality assurance sampling Nervous system diseases Tropical zone Vaccination Samplings Acute anterior poliomyelitis Epidemiology Infection Vaccination coverage Viral disease Arbovirus disease Central nervous system disease Spinal cord disease Yellow fever
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	0950-2688 1469-4409
DOI:	10.1017/S0950268811000331