Are Mexican free-tailed bats a SARS-CoV-2 reservoir? biorxivpreprint USGS SARSCoV2 COVID19 MexicanFreeTailedBat Bats
By Shanet Susan AlexJul 21 2022Reviewed by Aimee Molineux In a recent article posted to the bioRxiv* preprint server, investigators analyzed whether Mexican free-tailed bats were a severe acute respiratory syndrome coronavirus 2 reservoir.
Notably, concerns have been expressed that SARS-CoV-2 would spread to new hosts and infect bats and other wildlife species in North America. Large colonies of Mexican free-tailed bats ) are found in the southern United States , frequently in populated regions. As a result, they may come into contact with SARS-CoV-2 through infected people. Since they are migratory species, this species may carry SARS-CoV-2 from or to South and Central America if they are susceptible to it.
A competitive enzyme-linked immunosorbent assay was utilized to detect SARS-CoV-2 antibodies. The scientists monitored clinical signs of SARS-CoV-2 infection throughout the three-week study duration among the animals. They also conducted histopathologic and postmortem examinations. The utilized inoculum titer, i.e., 105 median tissue culture infectious dose /dose, was probably close to the 50% infectious dose for TABR since five of the ten, or 50%, inoculated bats were virus-infected. Yet, the highest viral concentration excreted by infected bats was within 103 to 104 TCID50 equivalents/ml. Therefore, contact transmission of SARS-CoV-2 between TABR would be improbable based on these data.
Another observation was that the SARS-CoV-2 infection in TABR did not appear to have any noticeable adverse health impacts. Although it was uncertain if infected wild bats would have impaired ability to provide maternal care, scavenge for food, or conduct other life activities, the research findings suggest that TABR populations were probably not at risk from the COVID-19 pandemic.
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