Foodborne Listeriosis
599
Figure 25–4 Ways in which L. monocytogenes is disseminated in the environment, animals, foods, and humans.
Source: From Audurier and Martin.
3
rate of 3.48%. In England and Wales, this organism was found in 4% of 56,959 ready-to-eat foods.
Over a 39-month period in the United States, 7.1% of 1,727 raw beef samples collected throughout the
country were positive for L. monocytogenes, and over a 21-month period, 19.3% of 3,700 raw broiler
necks and backs were positive.
52 From the same survey, 2.8% of a variety of ready-to-eat meats from
4,105 processing plants throughout the United States were positive for the organism.
The most common serovar in meat products from six countries was 1/2.
63 Serotype 4 was isolated
from meat products in five countries, and serotype 3 was recovered from products in only two countries.
Serotype 1/2 was found more often than serotype 4 in raw milk
83,105 and cheese,
106 and serotype 1
has been found in seafoods
128,131 and vegetables.
56 Serovar 4b was associated with a cluster of human
cases in Boston where raw vegetables appeared to be the source, whereas from potatoes and radishes,
serovars 1/2a and 1/2 were the most frequently occurring.
56 The three most prevalent serovars isolated
from foods, in decreasing order, are 1/2a, 1/2b, and 4b, whereas from human listeriosis, 4b, 1/2a, and
1/2b are the most prevalent.
22 The incidence/prevalence of L. monocytogenes in meats and poultry
can be found in Chapter 4—Table 4–6.
Of serovars isolated from humans, 59% of 722 L. monocytogenes isolated in Britain were 4b,
followed by 18, 14, and 4%, respectively, for 1/2a, 1/2b, and 1/2c.
93 From pathological specimens
throughout the world, 98% of isolates belonged to the following serovars: 1/2a, 1/2b, 1/2c, 3a, 3b,
3c, 4b, and 5.
113 Serovar 4b is by far the most often found in outbreak cases, and it appears that it
possesses virulence properties far greater than others.
599
Figure 25–4 Ways in which L. monocytogenes is disseminated in the environment, animals, foods, and humans.
Source: From Audurier and Martin.
3
rate of 3.48%. In England and Wales, this organism was found in 4% of 56,959 ready-to-eat foods.
Over a 39-month period in the United States, 7.1% of 1,727 raw beef samples collected throughout the
country were positive for L. monocytogenes, and over a 21-month period, 19.3% of 3,700 raw broiler
necks and backs were positive.
52 From the same survey, 2.8% of a variety of ready-to-eat meats from
4,105 processing plants throughout the United States were positive for the organism.
The most common serovar in meat products from six countries was 1/2.
63 Serotype 4 was isolated
from meat products in five countries, and serotype 3 was recovered from products in only two countries.
Serotype 1/2 was found more often than serotype 4 in raw milk
83,105 and cheese,
106 and serotype 1
has been found in seafoods
128,131 and vegetables.
56 Serovar 4b was associated with a cluster of human
cases in Boston where raw vegetables appeared to be the source, whereas from potatoes and radishes,
serovars 1/2a and 1/2 were the most frequently occurring.
56 The three most prevalent serovars isolated
from foods, in decreasing order, are 1/2a, 1/2b, and 4b, whereas from human listeriosis, 4b, 1/2a, and
1/2b are the most prevalent.
22 The incidence/prevalence of L. monocytogenes in meats and poultry
can be found in Chapter 4—Table 4–6.
Of serovars isolated from humans, 59% of 722 L. monocytogenes isolated in Britain were 4b,
followed by 18, 14, and 4%, respectively, for 1/2a, 1/2b, and 1/2c.
93 From pathological specimens
throughout the world, 98% of isolates belonged to the following serovars: 1/2a, 1/2b, 1/2c, 3a, 3b,
3c, 4b, and 5.
113 Serovar 4b is by far the most often found in outbreak cases, and it appears that it
possesses virulence properties far greater than others.