SARS-CoV-2 in Quarantined Domestic Cats from COVID-19 Households or Close Contacts, Hong Kong, China

converged toward the same result: the convalescentphase serum from the cat contained immunoglobulins against SARS-CoV-2, which were absent from the serum from control cats.These antibodies target several distinct viral proteins, and they caused a total neutralizing effect up to a much higher dilution than those from the owner's serum.This household cat was therefore productively infected with the SARS-CoV-2 virus excreted by its owner, and the infection caused a nonfatal but nevertheless severe disease, mainly of the respiratory system (Videos 2-6).Public health officials are still learning about SARS-CoV-2, but no current evidence indicates that pets play a role in spreading the virus.Therefore, taking measures against companion animals that may compromise their welfare is not justified. AcknowledgmentsWe thank Emmanuel Vidal and Sébastien Quesney for serologic testing.In addition, in alphabetical order, we thank K.-Y.Chen, C. Demeret, M. Franssen, and S. Temmam for their interventions in various capacities in the establishment of molecular and serologic diagnostics.