Doctoral student Ann Song of the Talbot Research Group found that the SARS-CoV-2 virus that causes COVID-19 can spill over from humans to mink, an agricultural species, and then spill back from mink to humans. Spill back is a concern because SARS-CoV-2 can mutate in the mink and come back to humans in a more virulent form. Both spill over and spill back of SARS-CoV-2 have been reported on mink farms in the United States and Europe. Read more here.