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EXPERIMENTAL PLASMODIUM VIVAX INFECTION OF KEY ANOPHELES SPECIES FROM THE BRAZILIAN AMAZON
Author
Affilliation
Fundação Oswaldo Cruz. Instituto Leônidas e Maria Deane. Manaus, AM, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, Brasil.
Fundação de Medicina Tropical Dr. Heitor Vieira Dourado. Manaus, AM, Brasil / Universidade do Estado do Amazonas. Manaus, AM, Brasil.
Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, Brasil / Universidade do Estado do Amazonas. Manaus, AM, Brasil. / Ministerio da Saúde. Núcleo Amazonas. Fundação de Vigilância em Saúde. Manaus, AM, Brasil.
Universidade Federal de Mato Grosso. Cuiabá, MT, Brasil.
Instituto Nacional de Pesquisas da Amazônia. Manaus, AM, Brasil.
Fundação Oswaldo Cruz. Instituto Leônidas e Maria Deane. Manaus, AM, Brasil.
Fundação de Medicina Tropical Dr. Heitor Vieira Dourado. Manaus, AM, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, Brasil.
Fundação de Medicina Tropical Dr. Heitor Vieira Dourado. Manaus, AM, Brasil / Universidade do Estado do Amazonas. Manaus, AM, Brasil.
Fundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, Brasil.
Fundação de Medicina Tropical Dr. Heitor Vieira Dourado. Manaus, AM, Brasil / Universidade do Estado do Amazonas. Manaus, AM, Brasil.
Instituto Nacional de Pesquisas da Amazônia. Manaus, AM, Brasil.
Fundação de Medicina Tropical Dr. Heitor Vieira Dourado. Manaus, AM, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas René Rachou; Belo Horizonte, MG, Brasil.
Fundação de Medicina Tropical Dr. Heitor Vieira Dourado. Manaus, AM, Brasil / Universidade do Estado do Amazonas. Manaus, AM, Brasil.
Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, Brasil / Universidade do Estado do Amazonas. Manaus, AM, Brasil. / Ministerio da Saúde. Núcleo Amazonas. Fundação de Vigilância em Saúde. Manaus, AM, Brasil.
Universidade Federal de Mato Grosso. Cuiabá, MT, Brasil.
Instituto Nacional de Pesquisas da Amazônia. Manaus, AM, Brasil.
Fundação Oswaldo Cruz. Instituto Leônidas e Maria Deane. Manaus, AM, Brasil.
Fundação de Medicina Tropical Dr. Heitor Vieira Dourado. Manaus, AM, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, Brasil.
Fundação de Medicina Tropical Dr. Heitor Vieira Dourado. Manaus, AM, Brasil / Universidade do Estado do Amazonas. Manaus, AM, Brasil.
Fundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, Brasil.
Fundação de Medicina Tropical Dr. Heitor Vieira Dourado. Manaus, AM, Brasil / Universidade do Estado do Amazonas. Manaus, AM, Brasil.
Instituto Nacional de Pesquisas da Amazônia. Manaus, AM, Brasil.
Fundação de Medicina Tropical Dr. Heitor Vieira Dourado. Manaus, AM, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas René Rachou; Belo Horizonte, MG, Brasil.
Abstract
Background: Anopheles darlingi is the major malaria vector in countries located in the Amazon region. Anopheles
aquasalis and Anopheles albitarsis s.l. are also proven vectors in this region. Anopheles nuneztovari s.l. and Anopheles
triannulatus s.l. were found infected with Plasmodium vivax; however, their status as vectors is not yet well defined.
Knowledge of susceptibility of Amazon anopheline populations to Plasmodium infection is necessary to better
understand their vector capacity. Laboratory colonization of An. darlingi, the main Amazon vector, has proven to be
difficult and presently An. aquasalis is the only available autonomous colony.
Methods: Larvae of An. darlingi, An. albitarsis s.l., An. nuneztovari s.l. and An. triannulatus s.l. were collected in the
field and reared until adult stage. Adults of An. aquasalis were obtained from a well-established colony. Mosquitoes
were blood-fed using a membrane-feeding device containing infected blood from malarial patients.
The infection of the distinct Anopheles species was evaluated by the impact variance of the following parameters:
(a) parasitaemia density; (b) blood serum inactivation of the infective bloodmeal; (c) influence of gametocyte
number on infection rates and number of oocysts. The goal of this work was to compare the susceptibility to P.
vivax of four field-collected Anopheles species with colonized An. aquasalis.
Results: All Anopheles species tested were susceptible to P. vivax infection, nevertheless the proportion of infected
mosquitoes and the infection intensity measured by oocyst number varied significantly among species. Inactivation
of the blood serum prior to mosquito feeding increased infection rates in An. darlingi and An. triannulatus s.l., but
was diminished in An. albitarsis s.l. and An. aquasalis. There was a positive correlation between gametocyte density
and the infection rate in all tests (Z = −8.37; p < 0.001) but varied among the mosquito species. Anopheles albitarsis
s.l., An. aquasalis and An. nuneztovari s.l. had higher infection rates than An. darlingi.
Conclusion: All field-collected Anopheles species, as well as colonized An. aquasalis are susceptible to experimental
P. vivax infections by membrane feeding assays. Anopheles darlingi, An. albitarsis s.l. and An. aquasalis are very
susceptible to P. vivax infection. However, colonized An. aquasalis mosquitoes showed the higher infection intensity
represented by infection rate and oocyst numbers. This study is the first to characterize experimental development
of Plasmodium infections in Amazon Anopheles vectors and also to endorse that P. vivax infection of colonized An.
aquasalis is a feasible laboratory model.
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