Public health officials confirmed Monday two more people in the Blackfoot area are sick with salmonellosis, making six people so far infected with the food-borne illness. Four people with similar symptoms have tested negative.

The health department’s team of investigators are anticipating results from the state lab in Boise. However, it could take several days to see if the individual cases originated from the same strain of the bacteria. Southeastern District Health Department spokeswoman Mary Howell said the investigative team may never uncover the source of the contamination.

Investigators anticipate a second-wave of infections could result from the original outbreak last week due to secondary infections from those infected passing the bacteria to family and friends.