22/07/2016 08H00 - Actualizado 22/07/2016 08h13

Estudio de la Fiocruz señala mosquito transmisor como posible virus Zika

La encuesta fue realizada por la Fiocruz Pernambuco, en el área metropolitana de Recife.
foto: reproducción
foto: reproducción

Un estudio de la Fundación Oswaldo Cruz (Fiocruz) encontrado la presencia de virus Zika en Culex quinquefasciatus mosquito (nombre científico de muriçoca o casa de mosquitos) recogido en la ciudad de Recife. Con eso, el insecto puede ser un posible virus transmisssor. Hasta el momento, ninguna investigación científica demuestra esta posibilidad.

La encuesta fue realizada por la Fiocruz Pernambuco, en el área metropolitana de Recife, donde la población de Culex quinquefasciatus se trata de 20 veces mayor que el Aedes aegypti, virus transmisor principal. Los resultados preliminares de la investigación de campo identificaron la presencia de Culex quinquefasciatus naturalmente infectados por el virus Zika en tres de 80 grupos de mosquitos analizados hasta la fecha. En dos de estas muestras, los mosquitos no se alimentaron, demostrando que el virus estaba muy extendida en el cuerpo del insecto y no en una alimentación reciente en un huésped infectado.

La colección de mosquitos se realizó basándose en las direcciones de los casos reportados de Zika en las ciudades de Recife y Arcoverde, obtenido del Departamento de Estado de Pernambuco Salud (SES-PE).

El número total de mosquitos examinados en el estudio fue de aproximadamente 500. El objetivo del proyecto es comparar el papel de algunas especies de mosquitos en Brasil la transmisión de arbovirus. Se dio prioridad al virus Zika debido al brote de la enfermedad en Brasil y su relación con los casos de microcefalia.

"La investigación simula condiciones viremia de un paciente real. En seguida, mosquitos se recogieron en diferentes momentos: sin tempo cero, pronto después de la infección, tres días, siete dias, 11 mi 15 días después de la infección de virus ", Explicó el investigador y coordinador del estudio, constancia Ayres.

Un grupo de control, mosquitos alimentados con sangre sin el virus, También se mantuvo. Cada mosquitos se diseccionó para extraer el intestino grueso, y la glándula salival, Los tejidos que presentan barreras para el desarrollo del virus. El procedimiento se lleva a cabo de tal manera que, la especie no es vectorial, en un cierto momento el desarrollo del virus es bloqueada por el mosquito. Sin embargo, la especie vector es, se produce la replicación del virus, Se difunde en el cuerpo del insecto y termina infectar la glándula salival, de la que se puede transmitir a otros huéspedes durante la alimentación de sangre, la liberación del virus de la saliva que contiene.

de acuerdo con la Constancia, a partir del tercer día después de la alimentación artificial, ha sido posible detectar la presencia de virus en las glándulas salivales de las dos especies de mosquito investigados: "Después de siete días, Se observó el pico de la infección en las glándulas salivales que fue confirmada por microscopía electrónica ".

De los datos obtenidos se requieren estudios adicionales para evaluar la posible participación de Culex en la propagación del virus Zika y su papel en la epidemia. El presente estudio tiene una gran relevancia, ya que las medidas de control de vectores son diferentes. Para evidenciar aún más los resultados de, la epidemia Zika política de control sigue siendo guiado por las mismas pautas, con su foco central en el control de Aedes aegypti.

fuente: Agencia Brasil

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