COVID-19 can be transmitted between domestic cats, even though infected cats may not show any symptoms, according to a research team working in Tokyo and Wisconsin.

Researchers from the University of Tokyo and the University of Wisconsin-Madison published the findings online Wednesday in the New England Journal of Medicine.

Yoshihiro Kawaoka, a veterinarian and professor in the research team, recommends cat owners keep their pets indoors, as they may contract the virus without the owner being aware.