Species of pets included
The objective was to prioritize the drivers of COVID-19 in pets. Using the following algorithms ((COVID-19) AND ((2019) OR (2020))), and ((COVID-19) AND (Pets)) search strings were conducted in PubMED (US National Library of Medicine, National Institutes of Health) and ProMED-mail (Program for Monitoring Emerging Diseases of the International Society for Infectious Diseases). The results of the search showed that cats, dogs and ferrets were the pets with most mentions in the articles, thus here the question was drivers for the emergence of COVID-19 in these species of pets. There was a big difference in the ratio between articles exclusively on “COVID-19 and pets” and “COVID-19 without pets” (Figure 1 ). The ratios were 0.00048 and 0.134 for PubMED and ProMED-mail, respectively at May 21, 2020.