[Changing susceptibility patterns of surgical site infection pathogens after the introduction of modern perioperative chemotherapy in the emergency surgery clinic].

993 surgical site infection aerobic pathogens are isolated over a six-year period (I.1994-I.2000) by the Microbiology Laboratory at University Hospital "Tzaritza Joana".

[Current antibiotic prophylaxis in colorectal surgery].

Over a one-year period (November 1996 to November 1997), in the Emergency Surgery Clinic perioperative parenteral antibiotic prophylaxis during colorectal operations is performed in a series of 32 patients, admitted on an emergency and deferred urgency basis, or for routine operative treatment. Of them 30 present malignant processes involving colon and rectum, and two--inflammatory diseases. All patients receive single i.

[The morphology of microcolonies as a criterion for recognizing bacteria in the differentiation of Streptococcus pyogenes and Streptococcus group B].

The authors studied the diagnostic importance of the morphology of microcolonies of S. pyogenes and group B streptococci in comparison with the currently used tests for the differentiation of these two species: the bacitracin test, the hydrolysis of sodium hippurate and the CAMP test. The standard tests proved to be positive in 94-97% and microcolonies had typical morphology in 86-95.

[Microcolony morphology as a criterion in bacterial diagnosis. The differentiation of Pneumococcus from alpha-hemolytic Streptococcus].

The authors have developed a method permitting the microscopic study of the morphology of bacteria and their relative position in microcolonies. Thus, the use of this method has made it possible to distinguish Streptococcus pneumoniae from other bacteria by the morphology of their microcolonies. In the study of 75 streptococcal strains, all strains yielding positive results in two or three tests, similarly to all strains pathogenic for mice, formed microcolonies with granular (pneumococcal) morphology, while all strains yielding negative results have been found to form microcolonies with catenulate ("nonpneumococcal") morphology.