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Free Content Changing scenario of malaria in central India, the replacement of Plasmodium vivax by Plasmodium falciparum (1986–2000)

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Summary Objectives 

Since 1986, we have been studying the changing epidemiology of malaria in a forest belt of Mandla, which has the highest number of malaria cases in central India (Madhya Pradesh) to define the epidemiological characteristics of the infection with each Plasmodium species in different seasons of the year. Our long-term objective was to determine the dynamics of Plasmodium vivaxvs.P. falciparum infections. Methods 

Five villages underwent fortnightly surveillance of fever cases. Drugs were distributed within 24 h after results of blood smears became available as per Indian National Anti-Malaria Programme. Indoor resting mosquitoes were also collected fortnightly. Results 

The only two Plasmodium species encountered were P. vivax and P. falciparum in both children and adults. Relatively more malaria infections were recorded in children (≤14 years) than adults (>14 years) (2 = 89.94, P < 0.00001). However, there were significant falling trends in P. vivax from 1986 to 2000 in both age groups (≤14 years from 63 to 13, P < 0.0001 and >14 years from 84 to 7, P < 0.0001). The indoor resting density of Anopheles culicifacies, an efficient vector resistant to both dichlorodiphenyltrichloroethane (DDT) (4%) and hexachlorocyclohexane (HCH) (0.4%), was very high throughout this period in all villages (52.35 ± 31.8, range 5–200 per man hour). Anopheles fluviatilis was present in small numbers 0.78 ± 1.24 (range 0–7 per man hour). Conclusion 

Major contributors of the changing epidemiology of malaria in this area are changing drug sensitivity along with insecticide sensitivity.
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Keywords: Anopheles culicifacies; Anopheles fluviatilis; Malaria; Plasmodium falciparum; Plasmodium vivax

Document Type: Research Article

Affiliations: 1:  Malaria Research Centre, Jabalpur, India 2:  Government Medical College, Jabalpur, India

Publication date: 2004-03-01

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