Food Protection Trends - May 2011 - (Page 268)

ARTICLES Copyright© 2011, International Association for Food Protection 6200 Aurora Ave., Suite 200W, Des Moines, IA 50322-2864 Food Protection Trends, Vol. 31, No. 5, Pages 268–273 Lessons to be Learned from an Outbreak of Foodborne Listeriosis, Austria 2009–2010 JULIANE PICHLER,1* GEORG APPL,1 ARIANE PIETZKA1 and FRANZ ALLERBERGER1,2 1 Austrian Agency for Health and Food Safety (AGES),Vienna, Austria; 2 Dept. of Microbiology, Hygiene and Infectious Disease, Paracelsus Medical University Salzburg, Salzburg, Austria INTRODUCTION ABSTRACT From June 2009 until February 2010, an outbreak of invasive listeriosis affected 25 persons in Austria, 8 in Germany and 1 in the Czech Republic.The source of this outbreak with 8 fatalities was initially identified based solely on epidemiological findings. Grocery receipts of purchases from 7 patients were collected prospectively during 3 weeks after discharge from hospital and compared for matches. This generated a hypothesis tested by a case control study, which revealed Austrian ‘Quargel’ cheese as the source of infection. At least two patients had consumed the contaminated product after it was withdrawn from the market. Risk communication with the public is of utmost importance, especially if hard-to-reach elderly are involved. Of 63 food samples of the product analyzed officially, 20 were positive for L. monocytogenes and 10 samples harbored >100 CFU/g (maximum 92,000 CFU/g). A leftover specimen, stored in a patient’s refrigerator, yielded 2,100,000 CFU/g of L. monocytogenes indistinguishable from the patient’s isolate. L. monocytogenes was first documented in the plant in a sample of smear fluid in May 2009, which temporarily coincided with major construction work. European legislation requires ‘Quargel’ not to exceed 100 CFU/g when products are placed on the market during their shelf life. A routine sample from a market had already shown 400 CFU/g in July 2009. We feel that a general zero tolerance policy would not have provided additional safety in this outbreak situation. Listeriosis is a rare but serious infection caused by Listeria monocytogenes. This organism can be found throughout the environment, in soil, vegetation, and animals. The main route of transmission is believed to be through consumption of contaminated food (1, 22, 29). However, infection can also, albeit very rarely, be transmitted directly from infected animals to humans (1). In neonatal infections, L. monocytogenes can be transmitted from mother to child in utero or during passage through the infected birth canal. There are also rare reports of nosocomial transmission attributed to contaminated material or patient-to-patient transmission via healthcare workers (1). The bacterium is particularly successful in causing foodborne disease, because it survives food processing technologies that rely on acidic conditions or high salt concentrations and, unlike many pathogens, can continue to multiply slowly at low temperatures, allowing growth to occur even in properly refrigerated foods (1). In recent years, an increasing rate of listeriosis has been reported in several A peer-reviewed article * Author for correspondence: Phone: 011.43.50555.37306; Fax: 011.43.50555.37109 E-mail: juliane.pichler@ages.at 268 FOOD PROTECTION TRENDS | MAY 2011 http://www.foodprotection.org/files/food-protection-trends/May-11-Pilcher.pdf

Table of Contents for the Digital Edition of Food Protection Trends - May 2011

Food Protection Trends - May 2011
Contents
Sustaining Members
Reflections of Your President
Commentary from the Executive Director
Lessons to be Learned from an Outbreak of Foodborne Listeriosis, Austria 2009–2010
Observations of Consumer Salad Preparation
IAFP Secretary Announcement
Highlights from the Dubai International Food Safety Conference
New Members
What’s Happening in Food Safety
Industry Products
Special Contributors and Sponsors
Preliminary Program
Ivan Parkin Lecture
John H. Silliker Lecture
Activities
General Information
Exhibitors
Workshops
Registration Rates
Coming Events
Advertising Index
Journal of Food Protection Table of Contents
Booklet Order Form
Membership Application
Celebrating 100 Years of IAFP: 1970s

Food Protection Trends - May 2011

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