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Table 1 Proportion of Salmonella positive samples and MPN quantification: Flock A

From: From hatch to egg grading: monitoring of Salmonella shedding in free-range egg production systems

 FloorDustNest boxEgg beltEggs
16 weeks
 Proportion00.10 ± 0.10000
 MPN/m2NM3.0aNMNMNM
28 weeks
 Proportion0.10 ± 0.100.50 ± 0.170.50 ± 0.170.50 ± 0.170
 MPN/m243a436.5 ± 237.5248.4 ± 213.49.7 ± 6.7NM
34 weeks
 Proportion00000.20 ± 0.13
 MPN/m2NMNMNMNM12.8 ± 0.4
40 weeks
 Proportion000.10 ± 0.100.10 ± 0.100
 MPN/m2NMNM3.0a3.0aNM
46 weeks
 Proportion00.10 ± 0.100.20 ± 0.130.10 ± 0.100
 MPN/m2NM4.3a1205 ± 11953.0aNM
52 weeks
 Proportion00.40 ± 0.160.10 ± 0.100.10 ± 0.100
 MPN/m2NM3.0 ± 0.03a9.2aNM
58 weeks
 Proportion00.10 ± 0.1000.10 ± 0.100
 MPN/m2NM9.2aNM43aNM
64 weeks
 Proportion0.10 ± 0.1000.10 ± 0.100.20 ± 0.100
 MPN/m2210aNM43a3.0 ± 0.0NM
70 weeks
 Proportion00.10 ± 0.10000
 MPN/m2NM9.2aNMNMNM
  1. Data are presented for each sample type as the proportion of Salmonella positive samples (± the standard error of the mean) and most probable number (MPN) (± the standard error of the mean).
  2. aOnly a single Salmonella positive sample was obtained.