Outbreak Summary

Introduction

CDC collaborated with public health and regulatory officials in several states and the U.S. Food and Drug Administration (FDA) to investigate a multistate outbreak of Listeria monocytogenes infections (listeriosis). Listeria causes a serious, life-threatening illness.

Public health investigators used the PulseNet system to identify illnesses that were part of this outbreak. Eight people infected with the outbreak strain of Listeria were reported from four states. Since the initial announcement on March 9, two more ill people were reported from New York. A list of states and the number of cases in each can be found on the Case Count Map page. Whole genome sequencing (WGS) performed on clinical isolates from all eight ill people showed that the isolates were closely related genetically. This close genetic relationship provided additional evidence that people in this outbreak became ill from a common source.

Listeria specimens from ill people were collected from September 1, 2016 to March 13, 2017. Ill people ranged in age from less than one year to 89 years, with a median age of 52 years. Five of eight ill people were female. All eight (100%) ill people were hospitalized, including two people from Connecticut and Vermont who died. One of the illnesses was reported in a newborn.

Investigation of the Outbreak

Epidemiologic and laboratory evidence indicated that soft raw milk cheese made by Vulto Creamery of Walton, New York, was the likely source of this outbreak.

State and local health departments interviewed ill people or their family members about the foods they ate or other exposures in the month before their illness started. Based on those interviews, eight (100%) of eight people ate a soft cheese. The ill resident of Florida reported traveling to New York state and eating soft cheese there before becoming ill. Available information indicated that cheese made by Vulto Creamery was for sale at stores where at least seven of the ill people bought cheese before getting sick.

The Connecticut Department of Public Health collected leftover cheeses from the home of the deceased person in Connecticut. The outbreak strain of Listeria was identified in a leftover cheese that the family identified as Ouleout cheese from Vulto Creamery.

The New York Division of Milk Control and Dairy Services collected three intact wheels of Ouleout cheese from Vulto Creamery. The outbreak strain of Listeria was identified in samples taken from the three wheels of cheese. On March 7, 2017, Vulto Creamery recalledExternal all lots of Ouleout, Miranda, Heinennellie, and Willowemoc soft wash-rind raw milk cheeses. On March 10, the company expanded the recall to include four other cheeses: Andes, Blue Blais, Hamden, and Walton Umber. The raw milk cheeses were distributed nationwide, with most sold in stores in the northeastern and Mid-Atlantic states; California; Chicago; Portland, Oregon; and Washington, D.C.

This outbreak appears to be over. However, CDC recommends that consumers do not eat, restaurants do not serve, and retailers do not sell recalled raw milk cheeses made by Vulto Creamery.