E Barnacle you are correct sir.

Steve you are funny lately. Perhaps you are in your element ;^/

Infra red cameras can capture flatulence up to 6 feet but mass spectometers can trace up to 12 feet. The research project spent a few million more on polarized laser electron microscopes but for 20 foot detection, test subject noses were subjected to the most silent and deadly.
They knew all along that sulpheric gastric acids kill Covid 19 but they had to spend the $ to keep the $.

'Corona Spread' sounds like an unfortunate product name like 'Zika' coconut drink.