It is a requirement of (US) Good Manufacturing Practice regulations that
workers report infectious conditions, such as open lesions, respiratory
diseases, etc., to supervisors.  This process should function based upon the
worker's awareness (by training) of their impact on the product.  Most (US)
companies provide physical examinations to their production employees, where
'testing' for infectious conditions could be employed.

Since it's been quite a while since my manufacturing days, I suppose the
issues of civil liberties and political correctness have to be considered.

HankG

The act of 'screening'

As far as screening is concerned,