Multistate Outbreak of Salmonella Anatum Infections Linked to Imported Maradol Papayas (Final Update)

Posted November 3, 2017 3:00 PM ET

This outbreak appears to be over. This outbreak was one of four separate multistate outbreaks identified in 2017 linked to imported Maradol papayas from four different farms in Mexico. For information on the other outbreaks, please visit the Reports of Salmonella Outbreak Investigations from 2017 webpage.

Highlights
  • Read the Recall and Advice to Consumers, Restaurants, and Retailers>>
  • This outbreak appears to be over.
  • CDC, public health and regulatory officials in several states, and the U.S. Food and Drug AdministrationExternal investigated a multistate outbreak of Salmonella Anatum infections.
  • Epidemiologic, laboratory, and traceback evidence indicated that Maradol papayas imported from Mexico by Bravo Produce Inc. of San Ysidro, California, were the likely source of this outbreak.
    • On September 10, 2017, Bravo Produce Inc. recalled Maradol papayas packed by Frutas Selectas de Tijuana, S. de RL de CV, Tijuana, Baja California, Mexico.
    • The papayas were distributed to California from August 10 to August 29, 2017.
  • Twenty people infected with the outbreak strain of Salmonella Anatum were reported from three states.
    • Illnesses started on dates ranging from December 20, 2016, to August 16, 2017.
    • Five ill people were hospitalized. One death was reported from California.
  • FDA testing identified the outbreak strain of Salmonella Anatum from a sample taken from an imported papaya at the U.S.-Mexico border.
Outbreak Summary

Introduction

CDC, public health and regulatory officials in several states, and the U.S. Food and Drug Administration (FDA)External investigated a multistate outbreak of Salmonella Anatum infections linked to Maradol papayas imported from Mexico by Bravo Produce Inc. of San Ysidro, California.

Public health investigators used the PulseNet system to identify illnesses that may have been part of this outbreak. Twenty people infected with the outbreak strain of Salmonella Anatum were reported from three states. A list of the states and the number of cases in each can be found on the Case Count Map page. Whole genome sequencing (WGS) showed that isolates from people infected with Salmonella were closely related genetically. This close genetic relationship means that people in this outbreak were more likely to share a common source of infection.

Illnesses started on dates ranging from December 20, 2016, to August 16, 2017. Ill people ranged in age from less than 1 year to 89, with a median age of 43. Among ill people, 85% were female. Among 11 people with available information, 10 (91%) were of Hispanic ethnicity. Among those 11 people, five (45%) were hospitalized. One death was reported from California.

Antibiotic susceptibility testing was performed by CDC’s National Antimicrobial Resistance Monitoring System (NARMS) laboratory on clinical isolates from four ill people in this outbreak. All four isolates did not show resistance to any of the antibiotics tested. In addition, WGS did not identify any antimicrobial resistance genes in isolates from 14 ill people. These findings are consistent with results from standard antibiotic susceptibility testing.

Investigation of the Outbreak

Epidemiologic and laboratory evidence indicated that Maradol papayas imported from Mexico were the likely source of this multistate outbreak.

In interviews, ill people answered questions about the foods they ate and other exposures in the week before they became ill. Ten (91%) of 11 people interviewed reported eating papayas. This proportion was significantly higher than results from a survey Cdc-pdf[PDF – 29 pages] of healthy Hispanic people in which 22% reported eating papayas in the week before they were interviewed. Five of these 10 people reported buying papayas from the same grocery store chain.

Although the epidemiologic information indicated that papayas were the likely source of this outbreak in spring of 2017, investigators could not determine the specific source of contaminated papayas and the outbreak investigation ended after illnesses stopped.

On September 4, 2017, FDA informed CDC that Salmonella Anatum was identified in an imported papaya sample. This sample came from a papaya from the farm Productores y Exportadores de Carica Papaya de Tecomán y Costa Alegre in Tijuana, Baja California, Mexico. WGS showed that the isolate from the papaya was closely related to isolates from 14 people infected with Salmonella Anatum in spring of 2017. Bravo Produce Inc. was a supplier of Maradol papayas to the grocery store chain where five of 10 ill people reported buying papayas.

After receiving FDA’s Salmonella isolate from papayas in September, CDC reviewed the PulseNet database to look for matching DNA fingerprints in bacteria from people who got sick more recently after the investigation closed in the spring of 2017. Six more ill people were identified and WGS showed that the Salmonella Anatum isolates from the papayas were closely related to the Salmonella isolates from these ill people.

On September 10, 2017, Bravo Produce Inc. recalled Maradol papayas packed by Frutas Selectas de Tijuana, S. de RL de CV. The grower of the recalled Maradol papayas was Productores y Exportadores de Carica Papaya de Tecoman y Costa Alegre in Tijuana, Baja California, Mexico.

This outbreak appears to be over. This outbreak was one of four separate multistate outbreaks identified in 2017 linked to imported Maradol papayas from Mexico. For information on the other outbreaks, please visit the Reports of Salmonella Outbreak Investigations from 2017 webpage.

Previous Outbreak Announcements

Introduction

This outbreak is one of four separate outbreaks currently under investigation that are linked to imported Maradol papayas from Mexico.

CDC, public health and regulatory officials in several states, and the U.S. Food and Drug Administration (FDA)External are investigating a multistate outbreak of Salmonella Anatum infections.

Public health investigators are using the PulseNet system to identify illnesses that may be part of this outbreak. PulseNet is the national subtyping network of public health and food regulatory agency laboratories coordinated by CDC. DNA fingerprinting is performed on Salmonella bacteria isolated from ill people by using techniques called pulsed-field gel electrophoresis (PFGE) and whole genome sequencing (WGS). CDC PulseNet manages a national database of these DNA fingerprints to identify possible outbreaks. WGS gives a more detailed DNA fingerprint than PFGE.

Investigation of the Outbreak

This past spring, CDC investigated a multistate outbreak of Salmonella Anatum infections. Fourteen people infected with the outbreak strain of Salmonella Anatum were reported from three states. A list of the states and the number of cases in each can be found on the Case Count Map page. WGS showed that isolates from people infected with Salmonella Anatum were closely related genetically. This close genetic relationship meant that people in this outbreak were more likely to share a common source of infection.

Illnesses started on dates ranging from December 20, 2016, to April 8, 2017. Ill people ranged in age from less than 1 year to 85, with a median age of 38. Ninety-two percent were female. Among 11 people with available information, 10 (91%) were of Hispanic ethnicity. Among those 11 people, 5 (45%) were hospitalized. One death was reported from California.

In interviews, ill people answered questions about the foods they ate and other exposures in the week before they became ill. Seven (88%) of eight people interviewed reported eating papayas. This proportion was significantly higher than results from a surveyCdc-pdf of healthy Hispanic people in which 22% reported eating papayas in the week before they were interviewed. In addition, four of these seven people reported buying papayas from the same grocery store chain.

While the epidemiologic information indicated that papayas were the likely source of this outbreak at the time, investigators could not determine the specific source of contaminated papayas and the outbreak investigation ended after illnesses stopped.

FDA informed CDC that a sample from an imported papaya identified Salmonella Anatum on September 4, 2017. This sample came from a papaya from a grower in Mexico named Productores y Exportadores de Carica Papaya  de Tecomán y Costa Alegre in Tijuana, Mexico. WGS showed that the isolate from the papaya and the isolates from the 14 people infected with Salmonella Anatum this past spring were closely related. Bravo Produce Inc. was a supplier of Maradol papayas to the grocery store chain where four of seven ill people reported buying papayas. After receiving FDA’s recent Salmonella isolate from papayas, CDC reviewed the PulseNet database to look for matching DNA fingerprints in bacteria from people who got sick after the investigation closed in the spring of 2017. Six more ill people have been identified and CDC is investigating to determine if these more recent illnesses are also linked to Maradol papayas imported by Bravo Produce Inc.

On September 10, 2017, Bravo Produce Inc. recalledExternal Maradol papayas packed by Frutas Selectas de Tijuana, S. de RL de CV. The grower of the recalled Maradol papayas is Productores y Exportadores de Carica Papaya de Tecoman y Costa Alegre in Tijuana, Mexico. The papayas were distributed to California from August 10 to August 29, 2017. The recalled papayas can be identified by the label on the fruit from the packing company, Frutas Selectas de Tijuana.

This investigation is ongoing. CDC and state and local public health partners are continuing laboratory surveillance through PulseNet to identify additional ill people and to interview them. FDA continues testing papayas from Mexico to see if other papayas from other farms are contaminated with Salmonella. Investigations are ongoing to determine if additional consumer warnings are needed beyond the advice not to eat papayas from specific importers or farms. Updates will be provided when more information is available.

At A Glance
  • Case Count: 20
  • States: 3
  • Deaths: 1
  • Hospitalizations: 5
  • Recall: Yes
Photo of a papaya cut open

Maradol Papaya: Maradol papayas are a large, oval fruit that weighs 3 or more pounds, with green skins that turn yellow when the fruit is ripe. The flesh inside the fruit is salmon-colored.