A new strain of norovirus accounted for 58% of the reported cases of what some people call “stomach flu” last month.

As if this year’s robust flu season weren’t enough, the Centers for Disease Control and Prevention reports today that a new strain of the vomiting disease norovirus has reached the USA from Australia. Last month, the bug, which causes nausea, forceful vomiting, diarrhea and abdominal pain, accounted for 58% of outbreaks of norovirus nationally.

It’s not clear whether this strain is more likely to infect people or make them more ill than previous strains, but according to Aron Hall, an epidemiologist with the CDC’s division of viral diseases, any time a new strain emerges, it has the potential to increase disease “because people haven’t been exposed to it before, so they’re more susceptible.”

Source: USA Today – New norovirus bug sweeps nation