On December 3, 2021, representatives from Antwerp Zoo in Antwerp, Belgium announced that two of their hippos tested positive for COVID-19 after runny nasal discharge was observed in the animals. Results were confirmed by the Sciensano National Veterinary Laboratory in Belgium.
This is the first known confirmed case of COVID-19 in hippos, and the source of exposure to the virus is unknown. Runny nasal discharge is the thus far the only symptom that the hippos have been exhibiting.
You can download a PDF of the official press release from Antwerp Zoo in English here.
You can read the official press release from Antwerp Zoo in English and French here.