Similarly , the National Veterinary Services Laboratories of the USDA have reported COVID-19 in tigers and lions that exhibited respiratory signs like dry cough and wheezing . The zoo animals are suspected to have been infected by an asymptomatic zookeeper (335). The total number of COVID-19 positive cases in human beings is increasing at a high rate, thereby creating ideal conditions for viral spillover to other species, such as pigs. The evidence obtain from SARS-CoV-2 (336)however experimental inoculation with SARS-CoV-2 failed to infect pigs(329)
