First Description of a Multisystemic and Lethal SARS-CoV-2 Variant of Concern P.1 (Gamma) Infection in a FeLV-Positive Cat: New Concerns Regarding Viral Re-emergence and Adaption to Pets

Background: Coronaviruses are recognized for their ability to cross the species barrier and infect new hosts. The coronavirus disease 2019 (COVID-19) is caused by the new coronavirus SARS-CoV-2 ( Severe acute respiratory syndrome coronavirus 2 ). It remains unclear whether other animals, including pets, are crucial in the spread and maintenance of COVID-19 worldwide. Methods: : In this study, we analysed the first fatal case of a SARS-CoV-2 and FeLV ( Feline leukemia virus ) co-infection of an eight-year-old male cat. We carried out a clinical evaluation, pathological analysis, and viral genomic analysis. Results: : As main results, we observed an animal presenting severe acute respiratory syndrome and lesions in several organs, which led to animal’s death. The causative agent was confirmed to be SARS-CoV-2, variant of concern P.1 (Gamma). The virus presented a pattern of mutations potentially associated with feline infection. In addition, the virus was detected by RT-qPCR in the spleen, liver, heart, lungs, trachea, intestines and kidneys, indicating a multisystemic viral infection. The virus was found in a high load in the trachea, suggesting a capacity of transmitting the virus. Conclusion: Our data show that felines, such as FeLV-positive cats, are susceptible to SARS-CoV-2 infection, and may be intermediate hosts in this pandemic.