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Table III.

Mortality, gross lesion, and bacterial recovery of Salmonella in the chickens inoculated with the wild type and mutants.

Strain Mortality
Gross lesiona
Bacterial recovery
n Death rate (%) n Liver Spleen Liver
Spleen
Ileum
Cecad
Counte No positivef Count No positive Count No positive Count No positive
JOL394 18 55.6 5 1.40 ± 0.80b 0.80 ± 0.40 < 1 0/5 < 1 0/5 < 1 0/5 < 1 0/5
JOL914 18 16.7 5 1.20 ± 0.40 1.00 ± 0.63 < 1 0/5 < 1 0/5 < 1 0/5 < 1 0/5
JOL915 18 22.2 5 1.20 ± 0.00 0.60 ± 0.49 c < 1 0/5 < 1 1/5 < 1 0/5 < 1 0/5
JOL916 18 0 5 1.00 ± 0.89 c 0.40 ± 0.20 c 1.03 ± 0.92 3/5 2.14 ± 1.75 3/5 < 1 1/5 < 1 1/5
Non 18 0 5 0.00 ± 0.00 c 0.00 ± 0.00 c < 1 0/5 < 1 0/5 < 1 0/5 < 1 0/5
a

Gross lesion was observed after sacrifice of randomly selected five animals per group at 2 weeks post inoculation.

b

Group lesion score (mean ± SEM).

c

The gross lesion score of the group with mutant is significantly different from the group with wild type SG (p < 0.05).

d

Cecum wall and cecal content.

e

Mean ± SEM Log10 cfu/g.

f

Number of positive sample after enrichment culture.

n, numbers of the birds used.