MHRA – Temperature screening products
https://www.gov.uk/government/news/dont-rely-on-temperature-screening-products-for-detection-of-coronavirus-covid-19-says-mhra

Prof Jackie Cassell – choirs and covid
https://www.jackiecassell.com/choirs-coronavirus-sexuallytransmitted/

Case report from USA
https://www.cdc.gov/mmwr/volumes/69/wr/mm6919e6.htm

other outbreaks
https://edition.cnn.com/2020/04/01/us/washington-choir-practice-coronavirus-deaths/index.htmlhttps://world-today-news.com/choirs-may-be-super-spreaders-nrc/
https://www.globaltimes.cn/content/1189811.shtml

false positives and negatives
Office for National Statistics
“we do not know the true sensitivity and specificity of the test because COVID-19 is a new virus”
https://www.ons.gov.uk/peoplepopulationandcommunity/healthandsocialcare/conditionsanddiseases/bulletins/coronaviruscovid19infectionsurveypilot/england17july2020