[Isolation of Salmonella from marine shellfish]. / Isolamento de Salmonella em moluscos marinhos.

The present paper reports the isolation of Salmonella from oysters and clams encountered in the marine waters of Santos and destined to the human consumption. The results obtained showed the characterization of 41 (59,43%) strains of Salmonella arizonae and 28 (40,57%) of Salmonella typhimurium, by its cultural biochemical and serological properties. The drug resistance of Salmonella to several antibiotics was also investigated by determining the minimal inhibitory concentration in serial agar plate dilutions of the therapeutic agents.

[Antimicrobial drugs in poultry nutrition: resistance levels in Escherichia coli]. / Drogas antimicrobianas em nutrição de aves: níveis de resistência em Escherichia coli.

In a battery experiment, a hundred of day old broiler chicks (Hubbard) divided into ten groups, were fed for eight weeks with 50, 75 or 100mg/Kg of ration of chloramphenicol and tetraciclyne; 40, 80 or 120mg/ 2 liters of drinking water of nitrofurazone. During three months defecated feces from each bird were sampled and analysed at intervals of 15 days for the isolation of Escherichia coli strains which were submitted to the determination of drug resistance. The results showed that utilization of antimicrobial drugs selected a resistant population of Escherichia coli at 300 microgram/ml of chloramphenicol tetraciclyne and 30 microgram/ml of nitrofurazone, during the dietary period. In addition the characterization of the R factor made by conjugation against apropriated recepient strains, demonstrated it's presence in some of the tested strains has only been noted the mobilization of the tetraciclyne marker.