First molecular detection of adenoviruses in bats from an urban Atlantic Forest in Rio de Janeiro, Brazil.

Bats comprise one of the most diverse and abundant groups of mammals in the world and host a significant viral diversity with zoonotic potential. Bat adenoviruses (bat AdVs), members of the family Adenoviridae, have been detected in several bat species, suggesting that bats are natural reservoirs. Here, faeces and rectal/anal-swabs were collected from 321 bats of an urban Atlantic Forest remnant from Rio de Janeiro, during 2019-2022, and screened for bat AdV nucleic acid with PCR. The positivity of bat AdVs was 3.7 % (12/321). Twelve individuals of four bat species were infected: Artibeus lituratus (66.7 %; 8/12), Desmodus rotundus (8.3 %; 1/12), Platyrrhinus lineatus (16.7 %; 2/12), and Sturnira lilium (8.3 %; 1/12). Phylogenetic analysis based on nucleotide and amino acid sequences showed that the detected bat AdVs clustered into four clades corresponding to the host species, identifying the presence of two potentially new bat adenoviruses. This is the first report of bat AdV detected in Platyrrhinus lineatus.