Moreover, viral RNA was detected in environmental samples after contact with SARS-CoV-2 exposed flies, although no infectious virus was recovered from these samples. Infectious virus was isolated only from the flies exposed to virus-spiked milk but not from those exposed to virus-spiked medium. ResultsĪll flies exposed to SARS-CoV-2-spiked media or milk substrates were positive for viral RNA at 4 h and 24 h post-exposure. During both studies, samples were collected at various time points post-exposure and evaluated by SARS-CoV-2-specific RT-qPCR and virus isolation.
In the second study, environmental samples were tested for infectivity after contact with SARS-CoV-2-exposed flies. In the first study, house flies were tested for infectivity after exposure to SARS-CoV-2-spiked medium or milk. Two independent studies were performed to address the study objectives. For this purpose, it was determined whether house flies can acquire SARS-CoV-2, harbor live virus and mechanically transmit the virus to naive substrates and surfaces. The goal of this work was to investigate the potential of house flies to mechanically transmit SARS-CoV-2. Previous studies have shown that house flies can mechanically transmit coronaviruses, such as turkey coronavirus however, the house fly’s role in SARS-CoV-2 transmission has not yet been explored. House flies are known to transmit bacterial, parasitic and viral diseases to humans and animals as mechanical vectors. SARS-CoV-2 is highly contagious and is transmitted via the oral–nasal route through droplets and aerosols, or through contact with contaminated fomites. COVID-19 in humans is characterized by a wide range of symptoms that range from asymptomatic to mild or severe illness including death. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a recently emerged coronavirus that is the causative agent of the coronavirus disease 2019 (COVID-19) pandemic.
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