Covid-19 cases could be missed because temperatures are more common in the evening than the morning
Daily Mail
Researchers concluded that up to half of people who have a fever may be missed, and said this would apply to other infectious diseases like Covid-19 after studying flu patients in Boston.
https://www.dailymail.co.uk/news/article-8627231/Covid-19-cases-missed-temperatures-common-evening-morning.html?ns_mchannel=rss&ns_campaign=1490&ito=1490