4.4 Article

Giardiasis Outbreak Associated with Asymptomatic Food Handlers in New York State, 2015

Journal

JOURNAL OF FOOD PROTECTION
Volume 80, Issue 5, Pages 837-841

Publisher

INT ASSOC FOOD PROTECTION
DOI: 10.4315/0362-028X.JFP-16-415

Keywords

Assemblage; Foodborne disease; Food handlers; Giardiasis

Funding

  1. Centers for Disease Control and Prevention [1U38OT000143-03, NU50CK000423]

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Giardia duodenalis is a protozoan that causes a gastrointestinal illness called giardiasis. Giardiasis outbreaks in the United States are most commonly associated with waterborne transmission and are less commonly associated with food, person-to person, and zoonotic transmission. During June to September 2015, an outbreak of 20 giardiasis cases occurred and were epidemiologically linked to a local grocery store chain on Long Island, New York. Further investigation revealed three asymptomatic food handlers were infected with G. duodenalis, and one food handler and one case were coinfected with Cryptosporidium spp. Although G. duodenalis was not detected in food samples, Cryptosporidium was identified in samples of spinach dip and potato salad. The G. duodenalis assemblage and subtype from one of the food handlers matched two outbreak cases for which genotyping could be performed. This outbreak highlights the potential role of asymptomatically infected food handlers in giardiasis outbreaks.

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