Many cases don't have fever. But the Wuhan study has already shown that asymptomatic cases don't spread the virus, so scanning the temperature is sufficient to protect travelers.
Post-lockdown SARS-CoV-2 nucleic acid screening in nearly ten million residents of Wuhan, China https://www.nature.com/articles/s41467-020-19802-w (they tested 10 million in a short period of time, 300 asymptomatic cases found, no transmission around them)
Many cases don't have fever. But the Wuhan study has already shown that asymptomatic cases don't spread the virus, so scanning the temperature is sufficient to protect travelers.
Post-lockdown SARS-CoV-2 nucleic acid screening in nearly ten million residents of Wuhan, China
https://www.nature.com/articles/s41467-020-19802-w
(they tested 10 million in a short period of time, 300 asymptomatic cases found, no transmission around them)
(post is archived)