Are census data accurate for estimating coverage of a lymphatic filariasis MDA campaign? Results of a survey in Sierra Leone

Autor: Wogba Kamara, Kathryn L. Zoerhoff, Edward Magbity, Donal Bisanzio, Emily Toubali, Mustapha Sonnie, Florence Macarthy, Mohamed Samai, Dhuly Chowdhury, Margaret Baker, Joseph B. Koroma, Abdulai Conteh, Mary H. Hodges
Rok vydání: 2019
Předmět:
Male
Maternal Health
Helminthiasis
Surveys
Onchocerciasis
Geographical locations
0302 clinical medicine
Pregnancy
Surveys and Questionnaires
Epidemiology
Medicine and Health Sciences
030212 general & internal medicine
Lymphatic filariasis
Response rate (survey)
education.field_of_study
Multidisciplinary
Pharmaceutics
Neglected Diseases
Obstetrics and Gynecology
Censuses
Census
Filariasis
Geography
Research Design
Helminth Infections
Medicine
Mass Drug Administration
Female
Research Article
Neglected Tropical Diseases
Adult
medicine.medical_specialty
Drug Administration
Science
030231 tropical medicine
Population
Albendazole
Research and Analysis Methods
Chemoprevention
Sierra leone
Sierra Leone
03 medical and health sciences
Elephantiasis
Filarial
Drug Therapy
medicine
Parasitic Diseases
Humans
education
Ivermectin
Survey Research
Lymphatic Filariasis
Coverage data
medicine.disease
Tropical Diseases
Filaricides
Age Groups
Africa
Women's Health
Population Groupings
People and places
Demography
Zdroj: PLoS ONE
PLoS ONE, Vol 14, Iss 12, p e0224422 (2019)
ISSN: 1932-6203
Popis: BackgroundPreventive chemotherapy was administered to 3.2 million Sierra Leoneans in 13 health districts for lymphatic filariasis, onchocerciasis, and soil transmitted helminthes from October 2008 to February 2009. This paper aims to report the findings of a coverage survey conducted in 2009, compare the coverage survey findings with two reported rates for lymphatic filariasis coverage obtained using pre-mass drug administration (MDA) registration and national census projections, and use the comparison to understand the best source of population estimates in calculating coverage for NTD programming in Sierra Leone.Methodology/principal findingsCommunity drug distributors (CDDs) conducted a pre- MDA registration of the population. Two coverage rates for MDA for lymphatic filariasis were subsequently calculated using the reported number treated divided by the total population from: 1) the pre-MDA register and 2) national census projections. A survey was conducted to validate reported coverage data. 11,602 persons participated (response rate of 76.8%). Overall, reported coverage data aggregated to the national level were not significantly different from surveyed coverage (z-test >0.05). However, estimates based on pre-MDA registration have higher agreement with surveyed coverage (mean Kendall's W = 0.68) than coverage calculated with census data (mean Kendall's = 0.59), especially in districts with known large-scale migration, except in a highly urban district where it was more challenging to conduct a pre-MDA registration appropriately. There was no significant difference between coverage among males versus females when the analyses were performed excluding those women who were pregnant at the time of MDA. The surveyed coverage estimate was near or below the minimum 65% epidemiological coverage target for lymphatic filariasis MDA in all districts.Conclusion/significanceThese results from Sierra Leone illustrate the importance of choosing the right denominator for calculating treatment coverage for NTD programs. While routinely reported coverage results using national census data are often good enough for programmatic decision making, census projections can quickly become outdated where there is substantial migration, e.g. due to the impact of civil war, with changing economic opportunities, in urban settings, and where there are large migratory populations. In districts where this is known to be the case, well implemented pre-MDA registration can provide better population estimates. Pre-MDA registration should, however, be implemented correctly to reduce the risk of missing pockets of the population, especially in urban settings.
Databáze: OpenAIRE
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