Health officials are investigating a salmonella outbreak in the Greenwood area that has sickened at least two dozen people in the last two months, reports the Indianapolis Star.

In June and July, 48 cases of salmonella have been reported in Marion and Johnson Counties. That’s about 30 cases more than are reported in a typical month, said Lynae Granzow, an enteric epidemiologist with the health department.

Those sickened may have picked up the bacteria from a restaurant, grocery store, untreated water source or a lizard, but investigators are declining to give specifics until the investigation is complete.