TABLE 3.
Histological analysis of neutrophils in the MLN of infected mice
| Group | Neutrophils in MLN infected with Y. enterocolitica strain
|
|||
|---|---|---|---|---|
| A127/90
|
WA
|
|||
| Mean (%)a | Range (%) | Mean (%)a | Range (%) | |
| Uninfected neonates | 0.97 | 0.22-2.02 | 0.92 | 0.76-1.14 |
| Infected neonates | 14.74b,c | 0.97-36.53 | 10.02b,c | 1.04-19.36 |
| Uninfected adults | 0.08 | 0.00-0.24 | 0.02 | 0.00-0.09 |
| Infected adults | 0.87d | 0.15-1.42 | 1.00d | 0.64-2.27 |
a
Percentage of neutrophils analyzed by Wright-Giemsa staining 3 days after infection with 5×107 CFU Y. enterocolitica A127/90 or 5×108 CFU Y. enterocolitica WA. Three or four uninfected and four to six infected mice were analyzed per group.
b
P ≤ 0.024 compared to uninfected neonates by Mann-Whitney test.
c
P ≤ 0.004 compared to infected adults by Mann-Whitney test.
d
P ≤ 0.017 compared to uninfected adults by Mann-Whitney test.