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Mosquito non-transmission

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Tabitha111 View Drop Down
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    Posted: July 21 2020 at 7:39am

 Mosquito non-transmission

Date: Fri 17 Jul 2020

Source: Nature Scientific Reports [edited]

https://www.nature.com/articles/s41598-020-68882-7


ref: Huang YS, Vanlandingham DL, Bilyeu AN, et al. SARS-CoV-2 failure

to infect or replicate in mosquitoes: an extreme challenge. Sci Rep.

2020; 10(1): 11915. doi:10.1038/s41598-020-68882-7

--------------------------------------------------------------------------------

Abstract

--------

This research addresses public speculation that SARS-CoV-2 might be

transmitted by mosquitoes. The World Health Organization has stated

"To date there has been no information nor evidence to suggest that

the new coronavirus could be transmitted by mosquitoes." Here we

provide the 1st experimental data to investigate the capacity of

SARS-CoV-2 to infect and be transmitted by mosquitoes including tests

of 3 widely distributed species of mosquito; _Aedes aegypti_, _Ae.

albopictus_, and _Culex quinquefasciatus_, representing the 2 most

significant genera of arbovirus vectors that infect people.

We demonstrate that even under extreme conditions, SARS-CoV-2 virus is

unable to replicate in these mosquitoes and therefore cannot be

transmitted to people even in the unlikely event that a mosquito fed

upon a viremic host.

[more at link]


Note:  Although the tests indicated SARS-CoV-2 virus was unable to replicate

in 3 common vector mosquitoes of 2 different genera, one cannot

arbitrarily rule out susceptibility of all human-biting mosquitoes in

localities where infected people are found.

However, the results of

the test above do strongly suggest that mosquitoes in general are not

susceptible to infection by this virus. This should end speculation

about mosquito biological transmission of SARS-CoV-2 virus being

epidemiologically significant. 

Mechanical ("flying pin") transmission

by interrupted mosquito feeding would require very high viremias in

infected individuals, probably 10^6-7 or more and for which there is

no evidence, followed almost immediately by feeding on a susceptible

person. Attention should be turned to other modes of virus

transmission. 


'A man who does not think and plan long ahead will find trouble right at his door.'
--Confucius

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