Unless, all corona virus do have certain cough signatures but...

Unless, all corona virus do have certain cough signatures but look at this R&D after they actually have significant revenues. It took SARS 18 years until COVID-19 emerged and with the more dense population and more unnecessary antibiotic which not only cause superbug (biggest problem in human) but now scientist think they can make our immune system less effective in fighting virus and ResAppDx can assist in the unnecessary use of antibiotics.......

https://www.livescience.com/62133-antibiotics-virus-infection-mice.html