The Food and Drug Administration has named a fourth farm in its investigation of contaminated maradol papayas that have sickened more than 220 people with salmonellosis.

The latest operation added to the list, Productores y Exportadores de Carica Papaya de Tecomán y Costa Alegre, has been linked to an outbreak of salmonella that the FDA began investigating in March.

Maradol papaya label from Frutas Selectas

That outbreak included 14 illnesses and one death, and now the Centers for Disease Control and Prevention is investigating whether six more recent cases can also be traced to product from that farm.

Other farms named in the broader investigation have been Carica de Campeche, Rancho El Ganadero and El Zapotanito, according to the FDA.

Product from each farm has tested positive for different strains of salmonella – and some for multiple strains – so the FDA and CDC are treating the situations as four separate outbreaks.

More than 200 illnesses have been sourced to Carica de Campeche, and one person has died. Sixty-five people have been hospitalized.

Three more illnesses have been traced to Rancho El Ganadero, and six more have been attributed to product from El Zapotanito, according to the CDC.

Product sold under brands Caribeña, Cavi, Valery and Frutas Selectas have been recalled as a result of the investigations.