Re:A woman dies of a superbug resistant to every available a...
by TeMPOraL on Monday January 16, 2017 @04:15AM
(#13408958)
Relevant: https://xkcd.com/1612/, especially alt-text: "The contagious period ends right around when you start to sound sick over the phone, which is probably evidence of cold viruses evolving to spread optimally in the workplace.".
That wouldn't work if the infectious stage of contamination comes before any obvious symptoms present themselves. Certainly in the case of colds and influenza the symptoms that make you look/feel unwell come days after you've been passing it to other people.