New? They have known that for a 100 years.
my point exactly. We used it in hospitals back in the 1960s, mainly above the door in nurseries to keep the air clean, and also in TB hospitals. And our local hospital here in the Philippines has the lights in corridors because TB is a problem.
in the USA they are starting to use it to stop the spread of C dif and antibiotic resistant staph.
The reason I posted a few articles is that with all the wuhan flu hysteria, no one seems to be discussing this old fashioned method of stopping spread.