Association between microfilarial load and excess mortality in onchocerciasis: an epidemiological study.

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Title: Association between microfilarial load and excess mortality in onchocerciasis: an epidemiological study.
Authors: Little MP (AUTHOR), Breitling LP (AUTHOR), Basáñez M (AUTHOR), Alley ES (AUTHOR), Boatin BA (AUTHOR), Little, M P (AUTHOR), Breitling, L P (AUTHOR), Basáñez, M-G (AUTHOR), Alley, E S (AUTHOR), Boatin, B A (AUTHOR)
Source: Lancet. 5/8/2004, Vol. 363 Issue 9420, p1514-1521. 8p.
Abstract: Background: Infection with the parasitic filarial nematode Onchocerca volvulus can lead to severe visual impairment and ultimately blindness. Excess mortality has been noted among people with onchocerciasis, but it is not clear whether this effect is entirely due to blindness, or mediated by some more direct effects of the infection. Methods: We assessed the relations between infection with O volvulus, visual acuity, and host mortality with data obtained by the Onchocerciasis Control Programme in West Africa from 2315 villages in 11 countries. Findings: 297,756 people were eligible for follow-up, and accumulated 2,579449 person-years of follow-up from 1971 through 2001. 24,517 people died during this period; 1283 (5.2%) of these deaths were due to onchocerciasis. Mortality of the human host was significantly and positively associated with increasing microfilarial burden (p<0.00001), but not with blindness after adjustment for microfilarial load and other variables. Overall, after adjustment for microfilarial load and other variables, female individuals had a risk of death about 7.5% lower than males (p<0.00001). Rates of mortality peaked in the mid 1980s but generally decreased thereafter. Interpretation: We have shown a direct relation between O volvulus microfilarial load and host mortality in a comprehensive dataset and in both sexes. [ABSTRACT FROM AUTHOR]
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  Data: Association between microfilarial load and excess mortality in onchocerciasis: an epidemiological study.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Lancet%22&quot;&gt;Lancet&lt;/searchLink&gt;. 5/8/2004, Vol. 363 Issue 9420, p1514-1521. 8p.
– Name: Abstract
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  Data: &lt;bold&gt;Background: &lt;/bold&gt;Infection with the parasitic filarial nematode Onchocerca volvulus can lead to severe visual impairment and ultimately blindness. Excess mortality has been noted among people with onchocerciasis, but it is not clear whether this effect is entirely due to blindness, or mediated by some more direct effects of the infection. &lt;bold&gt;Methods: &lt;/bold&gt;We assessed the relations between infection with O volvulus, visual acuity, and host mortality with data obtained by the Onchocerciasis Control Programme in West Africa from 2315 villages in 11 countries. &lt;bold&gt;Findings: &lt;/bold&gt;297,756 people were eligible for follow-up, and accumulated 2,579449 person-years of follow-up from 1971 through 2001. 24,517 people died during this period; 1283 (5.2%) of these deaths were due to onchocerciasis. Mortality of the human host was significantly and positively associated with increasing microfilarial burden (p&lt;0.00001), but not with blindness after adjustment for microfilarial load and other variables. Overall, after adjustment for microfilarial load and other variables, female individuals had a risk of death about 7.5% lower than males (p&lt;0.00001). Rates of mortality peaked in the mid 1980s but generally decreased thereafter. &lt;bold&gt;Interpretation: &lt;/bold&gt;We have shown a direct relation between O volvulus microfilarial load and host mortality in a comprehensive dataset and in both sexes. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Lancet is the property of Lancet and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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              Text: 5/8/2004
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