Abstract
Over a year into the COVID-19 pandemic, there is growing evidence that SARS-CoV-2 infections among dogs are more common than previously thought. In this study, the prevalence of SARS-CoV-2 antibodies was investigated in two dog populations. The first group was comprised of 1069 dogs admitted to the Veterinary Teaching Hospital for any given reason. The second group included dogs that shared households with confirmed COVID-19 cases in humans. This study group numbered 78 dogs. In COVID-19 infected households, 43.9% tested ELISA positive, and neutralising antibodies were detected in 25.64% of dogs. Those data are comparable with the secondary attack rate in the human population. With 14.69% of dogs in the general population testing ELISA positive, there was a surge of SARS-CoV-2 infections within the dog population amid the second wave of the pandemic. Noticeably seroprevalence of SARS-CoV-2 in the dog and the human population did not differ at the end of the study period. Male sex, breed and age were identified as significant risk factors. This study gives strong evidence that while acute dog infections are mostly asymptomatic, they can pose a significant risk to dog health. Due to the retrospective nature of this study, samples for viral isolation and PCR were unavailable. Still, seropositive dogs had a 1.97 times greater risk for developing central nervous symptoms.
Highlights
Animal origin of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)has been hypothesised since the beginning of the coronavirus disease (COVID-19) pandemic [1]
41.3% (n = 104) were positive for canine respiratory coronavirus (CRCoV), and 27 samples were known positive for canine coronavirus (CCoV) antibodies, but none of the pre-pandemic samples tested enzyme-linked immunosorbent assay (ELISA) positive
Dogs were classified into age groups corresponding to COVID-19 infected households
Summary
Animal origin of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)has been hypothesised since the beginning of the coronavirus disease (COVID-19) pandemic [1]. Animal origin of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). SARS-CoV-2 has a broad range of susceptible animal hosts [2,3]. Due to close contact with owners, pet animals were assumed to be at increased risk of infection in natural conditions. As opposed to the results of experimental infections [4], early studies showed that in natural settings probability of dogs getting infected is the same or higher than in cats [5,6,7,8]. The rising number of confirmed infections in dogs raises questions regarding the clinical consequences because the clinical spectrum of COVID-19 in humans is still being updated. An additional concern is rising over post-acute COVID-19 syndrome with a long-lasting effect on health [9]
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