Impact of the 2013 Floods on the Incidence of Malaria in Almanagil Locality, Gezira State, Sudan
Open Access
- 1 January 2018
- journal article
- Published by Public Library of Science (PLoS) in PLoS Currents
Abstract
Background: Heavy rain hit Sudan in August 2013 with subsequent flash floods in different parts of the country. This study investigated the impact of the flooding on incidence of malaria in Almanagil Locality in central Sudan. Methods: This observational retrospective study compared malaria data sets during rainfall seasons in the Almanagil Locality in the year of flooding (2013) with those of corresponding rainfall seasons of previous two non-flood years (2011 and 2012). Results: A marked increase of new malaria cases and incidence rate was observed in the 13 sentinel malaria notification sites in the locality (IR increased from 6.09 per 100,000 persondays in 2011 [95 % CI: 5.93-6.26] and 6.48 in 2012 [95 % CI: 6.31-6.65] to 8.24 in 2013 [95 % CI: 8.05-8.43] ; P< 0.0001), with a peaking of the incidence rate in the under-5-years age group (IR for this age group jumped from 9.80 per 100,000 persondays in 2011 [95 % CI: 9.2910.32] and 10.00 in 2012 [95 % CI: 9.5210.49] to 15.02 in 2013 [95 % CI: 14.4115.64]). A noticeable increase in the slide positivity rate (P< 0.0001) was observed in the 12-week period of 2013 (SPR = 20.86% [95 % CI: 20.40 21.32%]) compared with the same periods in 2011 (SPR = 8.72% [95 % CI: 8.36 9.08%]) and 2012 (SPR = 12.62% [95 % CI: 12.24 13.01%]), with a more marked rise of the SPR in the under-5-year age group. Hospital data showed increase in both the inpatient and outpatient incidence proportions in the study period of 2013 compared to those of the years 2011 and 2012. Hospital OPD incidence proportion in 2013 was 19.7% (95% CI: 19.2420.18%) compared to 12.85% (95% CI: 12.4813.23%) in 2011, and 12.16% (95% CI: 11.8212.51%) in 2012. The < 5 year old groups were responsible for the overall rise in the proportion of malaria cases in 2013 , particularly the < 1 year old group which more than doubled in the 2013 period compared to both 2011 and 2012 periods (Agespecific proportion of the outpatient malaria cases of the < 1 year old group in 2013 was19.5% [95% CI: 18.520.6%] compared to 7.7% [95% CI: 6.98.6%] in 2011 and 8.1% [95% CI: 7.38.9%] in 2012. Incidence proportion of severe malaria cases (inpatients) increased to 22.5 % (95 % CI: 21.5 to 23.6 %) in the study period of 2013 compared to 19.8 % (95 % CI: 18.6 to 21.0 %) in 2011 and 18.4 % (95 % CI: 17.4 to 19.5) in 2012. The increase in the proportion of severe malaria cases was mainly due to a higher proportion of children < 5 years of age and especially to a higher proportion of children < 1 year of age. Conclusion: The study revealed a significant increase in the incidence rate of malaria in Almanagil Locality following the flash flood of August 2013. The flooding had the highest impact on the malaria incidence of the under-5-years age group, and particularly of the under-1-year age group. Keywords: Flood, Flooding, Malaria, Disaster, Sudan, Gezira, AlmanagilKeywords
This publication has 35 references indexed in Scilit:
- Climate change and human infectious diseases: A synthesis of research findings from global and spatio-temporal perspectivesEnvironment International, 2017
- Severe Flooding and Malaria Transmission in the Western Ugandan Highlands: Implications for Disease Control in an Era of Global Climate ChangeThe Journal of Infectious Diseases, 2016
- Clinical Malaria Transmission Trends and Its Association with Climatic Variables in Tubu Village, Botswana: A Retrospective AnalysisPLOS ONE, 2016
- A Mixed Method to Evaluate Burden of Malaria Due to Flooding and Waterlogging in Mengcheng County, China: A Case StudyPLOS ONE, 2014
- The silent threat: asymptomatic parasitemia and malaria transmissionExpert Review of Anti-infective Therapy, 2013
- The spatial-temporal clustering of Plasmodium falciparum infection over eleven years in Gezira State, The SudanMalaria Journal, 2010
- Epidemics after Natural DisastersEmerging Infectious Diseases, 2007
- Post-flood — Infectious Diseases in MozambiquePrehospital and Disaster Medicine, 2002
- Effect of 1997–98 EI Niño on highland malaria in TanzaniaThe Lancet, 2000
- Nutritional and socio-demographic risk indicators of malaria in children under five: a cross-sectional study in a Sudanese rural community.1987