The stupid thing is that in all likelihood none of you are suffering from 'flu at all, but just bad colds. Flu is debilitatin to the point where it lays you out flat for at least a week and takes several more to recover fully. It's actually quite serious.
'Man 'flu', on the other hand, like 'bird flu', is worse than a cold, but not so bad as 'proper' 'flu. The former is characterised by the sufferer's delusion that he is either dead or will be so within a couple of days, such is the seriousness of his condition. Sufferers of the latter know they aren't dying, but feel compelled to remind everyone else how hard they continue to work despite their suffering - of which they also like to remind non-sufferers. Those girls at your work, flip-flop, may be taking time off, but they'll be working very hard catching up on the daytime soaps, and will tell you all about it when they get back.