Resistance of gram-negative bacteria to antibiotics in large calf agglomerations.

The antibiotic resistance of E. coli, Citrobacter, Enterobacter-Klebsiella and Pseudomonas aeruginosa strains isolated from calves was tested. A high proportion of multiresistance was found even in E.

Enterotoxin production by Staphylococcus aureus strains isolated from cases of chronic osteomyelitis.

Of 264 Staphylococcus aureus strains selected at random from 3,978 strains isolated from chronic osteomyelitis patients, 79 were found to produce enterotoxin. A majority of the strains (65%) were nontypable by phages belonging to the international phage set for human strain typing. The significance of these strains and their circulation among the population is discussed, especially from the standpoint of their possible role in the development of osteomyelitis.