The VIZIONS project in Vietnam in 2018 examined bat and rat urine and faeces. Alpha coronavirus was found in bats, beta in rats, with a comment that rats in China also carry coronavirus.
So, could rats play a part in the current Covid-19 transmission, or has this been ruled out?
See eg.
https://publications.csiro.au/rpr/pub?list=ASE&pid=csiro:EP176426&expert=false&sb=RECENT&n=7&rpp=10&page=35&tr=1443&dr=all&csiro.affiliation%7Ccsiro.projectBusinessUnit=50012450