Monitoring of malaria vectors at the China-Myanmar border while approaching malaria elimination

Zhang Shaosen, Zhou Shuisen, Zhou Zheng-bin, Chen Tian-mu, Wang Xue-zhong, Shi Wen-qi, Jiang Wei-kang, Li Ju-lin, Zhou Xiao-nong, Frutos Roger, Manguin Sylvie, Afelt Aneta. 2018. Monitoring of malaria vectors at the China-Myanmar border while approaching malaria elimination. Parasites and Vectors, 11:511, 12 p.

Quartile : Q1, Sujet : TROPICAL MEDICINE / Quartile : Q1, Sujet : PARASITOLOGY

Résumé : Background : Tengchong County was one of the counties located at the China-Myanmar border with high malaria incidence in the previous decades. As the pilot county for malaria elimination at the border area, Tengchong County is aiming to be the first county to achieve malaria elimination goal. A cross-sectional entomological survey was carried out to evaluate the feasibility of elimination approach and assess the receptivity of malaria reintroduction. Methods: Light traps associated with live baits were used to investigate the abundance of adult mosquitoes in nine villages in Tengchong County. Light traps were set to collect adult mosquitoes in both human houses and cowsheds from dusk till dawn in each site. Results: A total of 4948 adult Anopheles mosquitoes were collected from May to December in two villages. Of the mosquitoes were captured, 24.2% were in human houses and 75.8% in cowsheds. The peak of abundance occurred in July for An. sinensis and in September-October for An. minimus (s.l.) Ten Anopheles species were collected, the most prevalent being An. sinensis (50.3%), An. peditaeniatus (31.6%) and An. minimus (s.l.) (15.8%), contributing to 97.6% of the sample. Potential breeding sites were also investigated and a total of 407 larvae were collected, with An. sinensis (50.1%) and An. minimus (s.l.) (46.2%) as predominant species. Ponds and rice fields were the two preferred breeding sites for Anopheles mosquitoes; however, the difference between the number of adults and larvae captured suggest other breeding sites might exist. Both An. sinensis and An. minimus (s.l.) were found zoophilic with human blood index as 0.21 and 0.26, respectively. No Plasmodium positive Anopheles specimens were found by PCR among 4,000 trapped mosquitoes. Conclusions: Although no indigenous malaria cases have been reported in Tengchong County since 2013, there is still a risk from the presence of vectors in the context of human population movements from neighboring malaria endemic areas. The presence of An. sinensis, associated to rice fields, is particularly worrying. Sustained entomological surveillance is strongly suggested even after malaria elimination certification.

Mots-clés géographiques Agrovoc : Yunnan, Chine, Myanmar

Mots-clés libres : Malaria vector, China-Myanmar border, Malaria elimination, Ecological traits, Receptivity

Classification Agris : L73 - Maladies des animaux
S50 - Santé humaine
U30 - Méthodes de recherche

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

• Zhang Shaosen, National Centre for International Research on Tropical Diseases (CHN)
• Zhou Shuisen, National Centre for International Research on Tropical Diseases (CHN) - auteur correspondant
• Zhou Zheng-bin, National Centre for International Research on Tropical Diseases (CHN)
• Chen Tian-mu, National Centre for International Research on Tropical Diseases (CHN)
• Wang Xue-zhong, Yunnan Institute of Parasitic Diseases (CHN)
• Shi Wen-qi, National Centre for International Research on Tropical Diseases (CHN)
• Jiang Wei-kang, National Centre for International Research on Tropical Diseases (CHN)
• Li Ju-lin, Jiangsu Institute of Parasitic Diseases (CHN)
• Zhou Xiao-nong, National Centre for International Research on Tropical Diseases (CHN)
• Frutos Roger, CIRAD-BIOS-UMR INTERTRYP (FRA)
• Manguin Sylvie, IRD (FRA)
• Afelt Aneta, Warsaw agricultural University (POL)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/589214/)

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