WASHINGTON (Bloomberg) — The U.S. Food and Drug Administration added New Mexico, Indiana and one Mexican state to its list of places that are cleared of being the source of an outbreak of salmonella from contaminated tomatoes that has sickened 228 people since April.

The FDA has now cleared 37 states, Puerto Rico and parts of Florida as the source of the outbreak, according to the Web site of the agency, based near Washington, D.C. Six countries, including Israel and Guatemala, have been cleared.

The state of Baja California was the first area in Mexico to be certified safe, according to the Web site.