Just as human counts are incomplete, so are animal counts. But the first worldwide compilation of animal cases is a start at understanding the extent of human-to-animal transmission, scientists say.

Studies on white-tailed deer in Pennsylvania and Ontario offer evidence that the mammals are a reservoir for the coronavirus. What are the implications for the course of SARS-CoV-2?

A new study documents that infected hamsters, imported from the Netherlands, passed the virus on to humans. Previously only minks had been identified as a source of animal-to-human transmission.

The government announces a number of restrictions on parts of northern Denmark, the area hit hardest by the infections. Danish officials recently ordered the killing of up to 17 million minks.

The country said it discovered a virus mutation that can spread to humans. Danish officials are concerned it could impact the body's ability to form antibodies.