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Title: Malaria cross-sectional surveys identified asymptomatic infections of Plasmodium falciparum, Plasmodium vivax and Plasmodium knowlesi in Surat Thani, a southern province of Thailand
Authors: Shoichi Shimizu
Sadudee Chotirat
Nichakan Dokkulab
Isarachai Hongchad
Kessuda Khowsroy
Kirakorn Kiattibutr
Nongnuj Maneechai
Khajohnpong Manopwisedjaroen
Pattamaporn Petchvijit
Kanit Phumchuea
Nattawan Rachaphaew
Piyarat Sripoorote
Chayanut Suansomjit
Waraporn Thongyod
Amnat Khamsiriwatchara
Saranath Lawpoolsri
Borimas Hanboonkunupakarn
Jetsumon Sattabongkot
Wang Nguitragool
Mahidol University
Keywords: Medicine
Issue Date: 1-Jul-2020
Citation: International Journal of Infectious Diseases. Vol.96, (2020), 445-451
Abstract: © 2020 The Authors Objectives: Malaria cross-sectional surveys are rarely conducted in very low transmission settings. This study aimed to determine the prevalence and risk factors of Plasmodium infection in a near-elimination setting in southern Thailand. Methods: Two cross-sectional surveys were conducted in areas of active transmission in the Surat Thani province of Thailand in January and May 2019. PCR was used to detect Plasmodium infection. Results: The prevalence of Plasmodium blood infection was 0.45% and 0.61% in January and May 2019, respectively. The major parasite species was Plasmodium falciparum in January and Plasmodium vivax in May. Unexpectedly, Plasmodium knowlesi infections were also detected. Most infections, including those of Plasmodium knowlesi, were asymptomatic. Being male and staying outdoors at night-time were the only significant identified risk factors. Of people infected in January 28.0% were positive in May for the same parasite species, suggesting persistent asymptomatic infections. Conclusions: Despite the very low incidence rate in Surat Thani, most malaria infections were asymptomatic. Outdoor mosquito biting at night-time is likely an important mode of malaria transmission. Unexpectedly, asymptomatic Plasmodium knowlesi infection was found, confirming previous reports of such infection in mainland Southeast Asia.
ISSN: 18783511
Appears in Collections:Scopus 2020

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