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Background  On 11 March 2020, the World Health Organisation (WHO) declared the coronavirus disease 2019 (COVID-19) outbreak to be a pandemic. As the mosquito season progressed, the understandable concern that mosquitoes could transmit the virus began to increase among the general public and public health organisations. We have investigated the vector competence of  Culex pipiens  and  Aedes albopictus , the two most common species of vector mosquitoes in Europe, for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Due to the very unusual feeding behaviour of  Ae. albopictus , we also evaluated the role of this mosquito in a potential mechanical transmission of the virus.    Methods  For the vector competence study, mosquitoes were allowed to take several infectious blood meals. The mosquitoes were then collected and analysed at 0, 3, 7 and 10 days post-feeding. For the mechanical transmission test,  Ae. albopictus  females were allowed to feed for a short time on a feeder containing infectious blood and then on a feeder containing virus-free blood. Both mosquitoes and blood were tested for viral presence.    Results   Culex pipiens  and  Ae. albopictus  were found not be competent vectors for SARS-CoV-2, and  Ae. albopictus  was unable to mechanically transmit the virus.    Conclusions  This is the first study to show that the most common species of vector mosquitoes in Europe do not transmit SARS-CoV-2 and that  Ae. albopictus  is unable to mechanically transmit the virus from a positive host to a healthy host through host-feeding.

parasites and vectors

The common European mosquitoes Culex pipiens and Aedes albopictus are unable to transmit SARS-CoV-2 after a natural-mimicking challenge with infected blood