TABLE 6 Prevalence of Parasitic Infections and Infestations in Mice and Ratsa

Parasite

United States: Commercial Breedersb

United Kingdom: Accredited Breedersc

 

Mice

Rats

Mice

Rats

Entamoeba muris

51

24

27

28

Spironucleus muris

42

17

29

28

Pinworms

38

17

35

39

Tritrichomonas muris

26

17

24

27

Giardia muris

12

11

8

10

Hymenolepis sp.

4

0

2

 

Eimeria sp.

1

0

3

 

Mites

29

0

26

8

Polyplax sp.

 

0

 

5

No. of colonies

77

18

96

67

a Data are percentages of colonies found to be infected.

bFrom Lindsey et al., 1986a.

cFrom Sparrow, 1976.

suggests that the data given in Tables 4 and 5 for these agents are very conservative estimates of the true prevalence. The true prevalence of Bacillus piliformis is unknown, but recent surveys by serologic methods in Japan (Fujiwara, 1980), Scandinavia (Fries, 1980), and West Germany (Kraft and Meyer, 1986) suggest that infection by this agent may be common in mice and rats.

The data from two surveys of parasitic infections and infestations in mice and rats are given in Table 6. Entamoeba muris, Spironucleus muris, pinworms, Tritrichomonas muris, Giardia muris, and mites were all fairly common.

Based on the data in Tables 2 through 6, it must be concluded that only very modest success has been achieved in the prevention of microbial infections and parasitic infections and infestations of contemporary mice and rats.



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