How long is the contagion period of gastroenteritis?!
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There are many causes of gastroenteritis. Some of them can be bacterial. Others are viral. I'm going to address norovirus, a common source of viral gastroenteritis.
Norovirus can cause illness that lasts about 72 hours. A person with Noro can be contagious from less than 12 hours before onset (as onset tends to be about 12 hours following exposure), then they're contagious while they're sick (another 72 hours), then they can continue to shed virus 48 hours afterwards.
That's about 5 and a half days a person can be contagous with norovirus.
Things like Shigella and Salmonella can be contagious much longer than that (weeks, even MONTHS!).
Other Answers:
Roughly 1-3 days depending on the severity of the bout of GE and the extent of contact. The problem is, by the time you realize a loved one has it, you have already been exposed.
I was told by my doctors that it was seven days. To be on the safe side use different towels and try not to sneezze in front of others. It is an airborne disease!
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