Table 2.

Fecal excretion of defined mutants of S. typhimurium F98 (Nalr) by groups of 30 3-week-old chickens

Wk post- infection% of chickens excreting the following mutants at the indicated times after inoculationa
Parent straindks::kmsipC::kmhupA::kmrfbK::km
≥50DT≥50DT≥50DT≥50DT≥50DT
155290005733730070102565
251481000006700350025
301052005013400010000
3 (ceca)b 386790055478080102535055
  • a ≥50, 50 or more colonies isolated per direct plate; D, one or more colonies isolated per direct plate; T,Salmonella organisms isolated by direct plating or by enrichment culture.

  • b Cecal contents sampled immediately after killing.