ATLANTA, GA (MyBellinghamNow.com, AP) – A Washington state farm has been identified as an “onion grower of interest” in the ongoing E. coli poisoning investigation.

This comes as federal officials on Wednesday reported more cases of E. coli poisoning among people who ate at McDonald’s.

According to the latest government update, 90 people fell ill across 13 states and 27 were hospitalized. Officials have said raw, slivered onions on McDonald’s Quarter Pounder hamburgers are the likely source of the E. coli.

McDonald’s said the onions came from a single supplier, the California-based Taylor Farms. The company has since recalled the yellow onions it sent to McDonald’s and other restaurant chains.

The FDA said Wednesday it has begun inspecting Taylor Farm’s processing center in Colorado Springs as well as the Washington state farm.

The Washington-based onion grower has not been named.