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Volume 7, Number 6—December 2001

Research

Effect of Prevention Measures on Incidence of Human Listeriosis, France, 1987-1997

Véronique Goulet*Comments to Author , Henriette de Valk*, Olivier Pierre†, Frédéric Stainer‡, Jocelyne Rocourt§, Véronique Vaillant*, Christine Jacquet§, and Jean-Claude Desenclos*
Author affiliations: *Institut de Veille Sanitaire, Saint-Maurice, France;; †Direction Générale de la Concurrence, Bureau Hygiène, Paris, France;; ‡Direction Générale de l'Alimentation, Bureau des Préventions des Contaminations, Paris, France;; §Institut Pasteur, Paris, France

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Table 4

Proportion of ready-to-eat foods contaminated with Listeria monocytogenes (Lm) by food category, level of contamination, and period, France, 1993-1996

1993-94 1995-96 Percent change (%) pa
Ready-to-eat meat products
Number of samples 1,533 1,750
% of food contaminated by Lm
<100 CFU/gb 11 8.5 -23 0.02
>100 CFU/g 1.6 0.7 -56 0.03
Total 12.6 9.2 -28 0.003
Dairy products
Number of samples 1,695 1,846
% of food contaminated by Lm
<100 CFU/gb 3.2 2.7 -16 ns
>100 CFU/g 2.2 1.3 -41 0.03
Total 5.4 4 -26 0.03
Prepared salads
Number of samples 1,740 1,426
% of food contaminated by Lm
<100 CFU/gb 4.9 3.3 -33 0.02
>100 CFU/g 0.3 0.3 0 ns
Total 5.2 3.6 -31 0.02
Seafood-fish products
Number of samples 841 1,125
% of food contaminated by Lm
<100 CFU/gb 9.3 11.4 +22 ns
>100 CFU/g 0.7 0.5 -29 ns
Total 10 10.3 +18 ns
Total no. of samples 5,809 6,147
% of food contaminated by Lm
<100 CFU/gb 6.6 5.9 -10 ns
100 CFU/g 1.3 0.8 -38 0.007
Total 7.9 6.7 -16 0.008

aChi-square test with Yates correction or Fisher exact test.
bLevels of contamination <100 CFU/g but greater than zero.

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