Belly flu or gastroenteritis means the gastro tract has inflammation and this is due to some virus inside. There are 4 common virus types for belly flu: astrovirus, adenovirus, callcivirus, rotavirus.
This flu can be contagious and in both kids and adults. It is spread through contact and contamination. Signs appear after 48 hours of exposure and can last up to 5 or even 10 days.
This flu is really unpleasant and the signs are diarrhea, nausea, upset belly, body and head pains, cramps, fatigue, fever and vomiting.