333. The coliform flora of milk and dairy products

摘要: 1. The sources of error and general significance the presumptive coliform test have been studied, with special reference to manufactured dairy products.2. Eosine methylene blue agar has found reasonably satisfactory for isolation cultures but unsatisfactory as a direct plating medium.3. A wide survey flora raw milk products made over period 11 years. data were collected from 24,952 samples include incidence positive tests at each stage manufacturing processes, occurrence ‘false-positive’ tests, detailed distribution types in individual products, some preliminary observations on ‘heat-resistant’ strains.4. Material examined included milk, pasteurized ice cream, powder, condensed clotted butter, soft cheese, Cheddar processed swabs plant, churn rinses, atmosphere factories.5. Detailed confirmatory performed 2490 positives, which 2508 isolated classified.6. ecological frequency dairying operations whole attempted.7. Particular factors may affect specific or situations shown heat resistance, resistance drying, chemical composition substrate, effect storage, conditions prevailing plant surfaces. It is suggested that be partly result adaptation associated product.8. value discussed respect public health requirements, plant-control method, relation economic aspects. believed great utility laboratory little purposes.