Oh boy, not again.

  The only good news about Hep A is that if you have already had it, you are "immune" and likely can't get it again.  ( Source  http://www.sfcdcp.org/hepatitisa.html  )   Denver experienced a local "epidemic" of Hep A in 1970.   I remember it very "un-fondly."  Damn near killed some of us.

Wash your hands, wash your hands, and then, when in doubt,  wash your hands.  

You get it one glamorous way ... by unconsciously eating doo-doo, and unfortunately there are lots of ways to unknowingly do just that.   People who are infected are highly contagious but often without symptoms for as much as two-three weeks before they start to feel sick ...  plenty of time to "share" it with their families, friends & lovers.

Good luck (you'll need it) if you're  "mostly among men who have sex with other men ... People who use injection drugs, people who are homeless ..."    

Restaurant employees, please wash your hands often.  

Hep A is the worst, and can even kill ya'