Malaria entomological inoculation rates in gold mining areas of Southern Venezuela
A longitudinal study of malaria vectors aiming to describe the intensity of transmission was carried out in five villages of Southern Venezuela between January 1999-April 2000. The man-biting, sporozoite and entomological inoculation rates (EIR) were calculated based on 121 all-night collections of...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Fundação Oswaldo Cruz (FIOCRUZ)
2009-08-01
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| Series: | Memorias do Instituto Oswaldo Cruz |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762009000500017 |
| _version_ | 1797756631983849472 |
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| author | Jorge E Moreno Yasmín Rubio-Palis Elisa Páez Enrique Pérez Víctor Sánchez Elena Vaccari |
| author_facet | Jorge E Moreno Yasmín Rubio-Palis Elisa Páez Enrique Pérez Víctor Sánchez Elena Vaccari |
| author_sort | Jorge E Moreno |
| collection | DOAJ |
| description | A longitudinal study of malaria vectors aiming to describe the intensity of transmission was carried out in five villages of Southern Venezuela between January 1999-April 2000. The man-biting, sporozoite and entomological inoculation rates (EIR) were calculated based on 121 all-night collections of anophelines landing on humans, CDC light traps and ultra violet up-draft traps. A total of 6,027 female mosquitoes representing seven species were collected. The most abundant species were Anopheles marajoara Galvão & Damasceno (56.7%) and Anopheles darlingi Root (33%), which together accounted for 89.7% of the total anophelines collected. The mean biting rate for An. marajoara was 1.27 (SD + 0.81); it was 0.74 (SD + 0.91) for An. darlingand 0.11 (SD + 0.10) for Anopheles neomaculipalpus Curry and the overall biting rate was 2.29 (SD + 1.06). A total of 5,886 mosquitoes collected by all three methods were assayed by ELISA and 28 pools, equivalent to 28 mosquitoes, yielded positive results for Plasmodium spp. CS protein. An. neomaculipalpus had the highest sporozoite rate 0.84% (3/356), followed by An. darlingi 0.82% (16/1,948) and An. marajoara 0.27% (9/3,332). The overall sporozoite rate was 0.48% (28/5,886). The rates of infection by Plasmodium species in mosquitoes were 0.37% (22/5,886) for Plasmodium vivax(Grassi & Feletti) and 0.10% (6/5,886) for Plasmodium falciparum (Welch). The estimated overall EIR for An. darling was 2.21 infective bites/person/year, 1.25 for An. marajoara and 0.34 for An. neomaculipalpus. The overall EIR was four infective bites/person/year. The biting rate, the sporozoite rate and the EIR are too low to be indicators of the efficacy of control campaigns in this area. |
| first_indexed | 2024-03-12T18:04:21Z |
| format | Article |
| id | doaj.art-5c5ef1043f6041d0908a4e904ec6c919 |
| institution | Directory Open Access Journal |
| issn | 0074-0276 1678-8060 |
| language | English |
| last_indexed | 2024-03-12T18:04:21Z |
| publishDate | 2009-08-01 |
| publisher | Fundação Oswaldo Cruz (FIOCRUZ) |
| record_format | Article |
| series | Memorias do Instituto Oswaldo Cruz |
| spelling | doaj.art-5c5ef1043f6041d0908a4e904ec6c9192023-08-02T09:32:18ZengFundação Oswaldo Cruz (FIOCRUZ)Memorias do Instituto Oswaldo Cruz0074-02761678-80602009-08-01104576476810.1590/S0074-02762009000500017Malaria entomological inoculation rates in gold mining areas of Southern VenezuelaJorge E MorenoYasmín Rubio-PalisElisa PáezEnrique PérezVíctor SánchezElena VaccariA longitudinal study of malaria vectors aiming to describe the intensity of transmission was carried out in five villages of Southern Venezuela between January 1999-April 2000. The man-biting, sporozoite and entomological inoculation rates (EIR) were calculated based on 121 all-night collections of anophelines landing on humans, CDC light traps and ultra violet up-draft traps. A total of 6,027 female mosquitoes representing seven species were collected. The most abundant species were Anopheles marajoara Galvão & Damasceno (56.7%) and Anopheles darlingi Root (33%), which together accounted for 89.7% of the total anophelines collected. The mean biting rate for An. marajoara was 1.27 (SD + 0.81); it was 0.74 (SD + 0.91) for An. darlingand 0.11 (SD + 0.10) for Anopheles neomaculipalpus Curry and the overall biting rate was 2.29 (SD + 1.06). A total of 5,886 mosquitoes collected by all three methods were assayed by ELISA and 28 pools, equivalent to 28 mosquitoes, yielded positive results for Plasmodium spp. CS protein. An. neomaculipalpus had the highest sporozoite rate 0.84% (3/356), followed by An. darlingi 0.82% (16/1,948) and An. marajoara 0.27% (9/3,332). The overall sporozoite rate was 0.48% (28/5,886). The rates of infection by Plasmodium species in mosquitoes were 0.37% (22/5,886) for Plasmodium vivax(Grassi & Feletti) and 0.10% (6/5,886) for Plasmodium falciparum (Welch). The estimated overall EIR for An. darling was 2.21 infective bites/person/year, 1.25 for An. marajoara and 0.34 for An. neomaculipalpus. The overall EIR was four infective bites/person/year. The biting rate, the sporozoite rate and the EIR are too low to be indicators of the efficacy of control campaigns in this area.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762009000500017man-biting ratesporozoite rateentomological inoculation rateAnophelesPlasmodiumVenezuela |
| spellingShingle | Jorge E Moreno Yasmín Rubio-Palis Elisa Páez Enrique Pérez Víctor Sánchez Elena Vaccari Malaria entomological inoculation rates in gold mining areas of Southern Venezuela Memorias do Instituto Oswaldo Cruz man-biting rate sporozoite rate entomological inoculation rate Anopheles Plasmodium Venezuela |
| title | Malaria entomological inoculation rates in gold mining areas of Southern Venezuela |
| title_full | Malaria entomological inoculation rates in gold mining areas of Southern Venezuela |
| title_fullStr | Malaria entomological inoculation rates in gold mining areas of Southern Venezuela |
| title_full_unstemmed | Malaria entomological inoculation rates in gold mining areas of Southern Venezuela |
| title_short | Malaria entomological inoculation rates in gold mining areas of Southern Venezuela |
| title_sort | malaria entomological inoculation rates in gold mining areas of southern venezuela |
| topic | man-biting rate sporozoite rate entomological inoculation rate Anopheles Plasmodium Venezuela |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762009000500017 |
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