Coliform, Escherichia coli, and salmonellae concentrations in a multiple-tank, counterflow poultry scalder

Scald water samples from a commercial broiler processing plant were tested for coliforms, Escherichia coli, and salmonellae to evaluate the numbers of suspended bacteria in a multiple-tank, counterflow scalder. Water samples were taken from each of three tanks on 8 different days after 6-week-old br oilers had been processed for 8 h. Coliforms and E. coli were counted using Petrifilm, and the most probable number (MPN) of salmonellae was determine d both in water samples and in rinses of defeathered carcasses that were re moved from the processing line immediately after taking the water samples. Mean coliform concentrations in tanks 1, 2, and 3 (the last tank that carca sses pass through before being defeathered) were 3.4, 2.0, and 1.2 log(10)( CFU/ml), respectively. E. coli concentrations followed the same pattern wit h means of 3.2, 1.5, and 0.8 in tanks 1, 2, and 3, respectively, with signi ficant differences (P < 0.02) in the concentrations of both coliforms and E . coli between the tanks. Sixteen of 24 scald-water samples were positive f or salmonellae with a geometric mean of 10.9 MPN/100 ml in the positive sam ples. Salmonellae were isolated from seven of eight water samples from both tanks 1 and 2, but in only two of eight water samples from tank 3, the las t tank that carcasses pass through. It appears that most bacteria removed f rom carcasses during scalding are washed off during the early part of scald ing.