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Sri Lanka malaria maps.

Briët OJ, Gunawardena DM, van der Hoek W, Amerasinghe FP - Malar. J. (2003)

Bottom Line: The maps show that Plasmodium vivax malaria incidence has a marked variation in distribution over the island.The incidence of Plasmodium falciparum malaria follows a similar spatial pattern but is generally much lower than that of P. vivax.In the north, malaria shows one seasonal peak in the beginning of the year, whereas towards the south a second peak around June is more pronounced.

View Article: PubMed Central - HTML - PubMed

Affiliation: International Water Management Institute, Colombo, Sri Lanka. o.briet@cgiar.org

ABSTRACT

Background: Despite a relatively good national case reporting system in Sri Lanka, detailed maps of malaria distribution have not been publicly available.

Methods: In this study, monthly records over the period 1995 - 2000 of microscopically confirmed malaria parasite positive blood film readings, at sub-district spatial resolution, were used to produce maps of malaria distribution across the island. Also, annual malaria trends at district resolution were displayed for the period 1995 - 2002.

Results: The maps show that Plasmodium vivax malaria incidence has a marked variation in distribution over the island. The incidence of Plasmodium falciparum malaria follows a similar spatial pattern but is generally much lower than that of P. vivax. In the north, malaria shows one seasonal peak in the beginning of the year, whereas towards the south a second peak around June is more pronounced.

Conclusion: This paper provides the first publicly available maps of both P. vivax and P. falciparum malaria incidence distribution on the island of Sri Lanka at sub-district resolution, which may be useful to health professionals, travellers and travel medicine professionals in their assessment of malaria risk in Sri Lanka. As incidence of malaria changes over time, regular updates of these maps are necessary.

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Trends of Annual parasite incidence Trends of annual parasite incidence of P. falciparum (red bars) and P. vivax (blue bars) malaria over the years 1995 (bar on far left) to 2002 (bar on far right), at district resolution. The height of the bars in the legend represents an annual parasite incidence of 10 cases per 1000 persons.
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Figure 3: Trends of Annual parasite incidence Trends of annual parasite incidence of P. falciparum (red bars) and P. vivax (blue bars) malaria over the years 1995 (bar on far left) to 2002 (bar on far right), at district resolution. The height of the bars in the legend represents an annual parasite incidence of 10 cases per 1000 persons.

Mentions: Figure 3 shows the trends of annual parasite incidence of P. falciparum and P. vivax malaria over the years 1995 to 2002, at district resolution. P. falciparum and P. vivax generally show similar trends over the 8-year period. However, there is considerable variation in temporal trends over the country, even at a relatively short distance: In Jaffna, malaria incidence went down after 1998, whereas it still increased in the neighbouring districts of Kilinochchi and Mullaitivu. For Mannar, data were incomplete. Although the malaria incidence showed a general increase over the 1995 – 2000 period, it declined strongly after 2000. The ongoing peace process may be an important contributing factor for the recent decline in cases in the conflict zone. Notably the access to the area for spray teams has been increased. Also, foreign aid organisations have been providing insecticide-impregnated bednets in the affected areas. The variation in temporal trends and socio-political developments illustrate the need for regular updates of malaria distribution maps such as shown in Figures 1 and 2.


Sri Lanka malaria maps.

Briët OJ, Gunawardena DM, van der Hoek W, Amerasinghe FP - Malar. J. (2003)

Trends of Annual parasite incidence Trends of annual parasite incidence of P. falciparum (red bars) and P. vivax (blue bars) malaria over the years 1995 (bar on far left) to 2002 (bar on far right), at district resolution. The height of the bars in the legend represents an annual parasite incidence of 10 cases per 1000 persons.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC183859&req=5

Figure 3: Trends of Annual parasite incidence Trends of annual parasite incidence of P. falciparum (red bars) and P. vivax (blue bars) malaria over the years 1995 (bar on far left) to 2002 (bar on far right), at district resolution. The height of the bars in the legend represents an annual parasite incidence of 10 cases per 1000 persons.
Mentions: Figure 3 shows the trends of annual parasite incidence of P. falciparum and P. vivax malaria over the years 1995 to 2002, at district resolution. P. falciparum and P. vivax generally show similar trends over the 8-year period. However, there is considerable variation in temporal trends over the country, even at a relatively short distance: In Jaffna, malaria incidence went down after 1998, whereas it still increased in the neighbouring districts of Kilinochchi and Mullaitivu. For Mannar, data were incomplete. Although the malaria incidence showed a general increase over the 1995 – 2000 period, it declined strongly after 2000. The ongoing peace process may be an important contributing factor for the recent decline in cases in the conflict zone. Notably the access to the area for spray teams has been increased. Also, foreign aid organisations have been providing insecticide-impregnated bednets in the affected areas. The variation in temporal trends and socio-political developments illustrate the need for regular updates of malaria distribution maps such as shown in Figures 1 and 2.

Bottom Line: The maps show that Plasmodium vivax malaria incidence has a marked variation in distribution over the island.The incidence of Plasmodium falciparum malaria follows a similar spatial pattern but is generally much lower than that of P. vivax.In the north, malaria shows one seasonal peak in the beginning of the year, whereas towards the south a second peak around June is more pronounced.

View Article: PubMed Central - HTML - PubMed

Affiliation: International Water Management Institute, Colombo, Sri Lanka. o.briet@cgiar.org

ABSTRACT

Background: Despite a relatively good national case reporting system in Sri Lanka, detailed maps of malaria distribution have not been publicly available.

Methods: In this study, monthly records over the period 1995 - 2000 of microscopically confirmed malaria parasite positive blood film readings, at sub-district spatial resolution, were used to produce maps of malaria distribution across the island. Also, annual malaria trends at district resolution were displayed for the period 1995 - 2002.

Results: The maps show that Plasmodium vivax malaria incidence has a marked variation in distribution over the island. The incidence of Plasmodium falciparum malaria follows a similar spatial pattern but is generally much lower than that of P. vivax. In the north, malaria shows one seasonal peak in the beginning of the year, whereas towards the south a second peak around June is more pronounced.

Conclusion: This paper provides the first publicly available maps of both P. vivax and P. falciparum malaria incidence distribution on the island of Sri Lanka at sub-district resolution, which may be useful to health professionals, travellers and travel medicine professionals in their assessment of malaria risk in Sri Lanka. As incidence of malaria changes over time, regular updates of these maps are necessary.

Show MeSH
Related in: MedlinePlus