Serrano peppers from Mexico are now being linked to the salmonella outbreak in the U.S. after the Food and Drug Administration (FDA) found the bacteria strain at a Mexican farm growing the hot chili.

The salmonella Saintpaul strain found in the irrigation water and serrano peppers grown at a farm in Nuevo Leon, Mexico, prompted the FDA to issue a public warning against eating serranos.

Dr. David Acheson, FDA's chief of food safety, released the agency's findings Wednesday in a hearing before Congress.

Last week, the FDA found salmonella Saintpaul in a jalapeno pepper at a Texas vegetable distribution plant. The agency traced the pepper to a Mexican farm.

The food poisoning outbreak that has sickened 1,300 people nationwide since April was initially blamed on raw tomatoes.