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- Title
Risk clusters of Schistosoma mansoni infection in an endemic state of Brazil: space–time modelling and association with socio-economic and environmental factors.
- Authors
Souza, Mariana do Rosário; Jesus, Damyres Menezes S de; Santos, Alexrangel H Cruz; Lima, Shirley V M Almeida; Santos, Allan dos; Tavares, Débora dos Santos; Araújo, Karina Conceição G M de; Bezerra-Santos, Márcio
- Abstract
Background We analysed the spatial distribution and the socio-economic and environmental factors (SEFs) associated with Schistosoma mansoni infection in the state of Alagoas, an important tourist area in northeastern Brazil. Methods We conducted an ecological time-series study (2007–2016) on schistosomiasis cases and SEFs. We evaluated the temporal trends of schistosomiasis cases (annual percentage change [APC]) and their correlation with SEFs. Spatial analysis maps were built using QGIS and TerraView software. Results We observed that 4.9% of the municipalities had a high prevalence of S. mansoni infection and were located mainly in the coastal strip of Alagoas state. The positivity rate for schistosomiasis decreased during the period (8.1% in 2007 to 4.9% in 2016; APC=−5.71). There was a reduction in the number of tests performed (APC=−5.05). There was a negative correlation between S. mansoni infection and the municipal human development index (ρ=−0.34) and schooling rate (ρ=−0.24). The main species of snail was Biomphalaria glabrata (94.79%), but Biomphalaria straminea showed a higher percentage of S. mansoni detection (10.11%). Lastly, Biomphalaria tenagophila specimens were identified for the first time in Alagoas (n=28). Conclusions Despite a reduction in the number of cases, intestinal schistosomiasis still represents a serious public health concern in Alagoas. It urgently requires planning and improvements in diagnosis, prevention programs and the state's socio-economic indicators.
- Subjects
ALAGOAS (Brazil); BRAZIL; SCHISTOSOMA mansoni; ENDEMIC diseases; SOCIOECONOMIC factors; BIOMPHALARIA glabrata; SPACETIME
- Publication
Transactions of the Royal Society of Tropical Medicine & Hygiene, 2022, Vol 116, Issue 2, p108
- ISSN
0035-9203
- Publication type
Article
- DOI
10.1093/trstmh/trab090