TABLE 1.
Mean viable counts of Salmonella serovar Pullorum 449/87 recovered from organs and tissues from experimentally infected commercial laying hens 1 to 42 weeks following infection (± standard errors of the means)a
| Tissue | Time (wk) postinfection
|
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1
|
5
|
10
|
15
|
20
|
24
|
42
|
||||||||
| No. positive/ no. total | Mean count (± SEM) | No positive/ no. total | Mean count (± SEM) | No. positive/ no. total | Mean count (± SEM) | No. positive/ no. total | Mean count (± SEM) | No. positive/ no. total | Mean count (± SEM) | No. positive no. total | Mean count (± SEM) | No. positive/ no. total | Mean count (± SEM) | |
| Spleen | 5/5 | 4.7 × 104 (±2.2) | 5/5 | 3.2 × 104 (±2.5) | 1/5 | 1.6 × 102 (±1.6) | 1/5 | + | 2/5 | 2.5 × 102 (±2.4) | 1/5 | 4.8 × 103 (±4.8) | 5/10 | 2.5 × 102 (±1.6) |
| Liver | 5/5 | 2.0 × 105 (±0.9) | 5/5 | 9.2 × 102 (±6.5) | 0/5 | − | 1/5 | + | 1/5 | + | 1/5 | 80 (±80) | 3/10 | 60 (±43) |
| Ovarian tissue | 5/5 | 1.5 × 104 (±0.6) | 1/5 | + | 1/5 | + | 1/5 | + | 1/3 | + | 3/5 | + | 5/10 | + |
| Yolk in ovary | ND | ND | ND | ND | ND | ND | ND | ND | 1/3 | + | 3/5 | + | 4/10 | + |
| Upper oviduct | ND | ND | ND | ND | ND | ND | ND | ND | 1/3 | 6.0 × 102 (±6.0) | 2/5 | 82 (±80) | 3/10 | 20 (±20) |
| Lower oviduct | ND | ND | ND | ND | ND | ND | ND | ND | 1/3 | 6.0 × 103 (±6.0) | 2/5 | 6.0 × 102 (±4.1) | 4/10 | 1.5 × 102 (±1.1) |
| Eggs in oviduct | ND | ND | ND | ND | ND | ND | ND | ND | 1/3 | ND | 2/3 | ND | 1/8 | ND |
| Heart | 5/5 | 7.6 × 104 (±4.1) | 1/5 | 3.2 × 103 (±3.2) | 2/5 | 2.8 × 102 (±1.7) | 1/5 | 3.2 × 103 (±3.2) | 2/5 | 20 (±20) | 0/5 | − | 2/10 | 33 (±33) |
| Cecal contents | 4/5 | 6.8 × 103 (±4.2) | 0/5 | − | 0/5 | − | 0/5 | − | 0/5 | − | 0/5 | − | 1/10 | 5.6 × 103 (±5.6) |
| Breast muscle | 2/5 | + | 0/5 | − | 0/5 | − | 0/5 | − | 0/5 | − | 0/5 | − | 0/5 | − |
| Bone marrow | 4/5 | 4.4 × 103 (±1.8) | 2/5 | 80 (±80) | 0/5 | − | 0/5 | − | 0/5 | − | 0/5 | − | ND | ND |
a
Five birds were taken for postmortem analysis at each time point, except at 42 weeks postinfection, when 10 were taken. ND, not done; +, positive culture by enrichment; −, negative culture following enrichment.