RESUMEN
A total of 30 isolates of enterotoxigenic E. coli. derived from diarrheal patients were examined for serotype and toxigenicity. The transferability of enterotoxin plasmid and plasmid profile analysis of enterotoxigenic E. coli. revealed that the strains with the same [O] serotype and toxigenicity carry closely related enterotoxin plasmids. Most strains of LT producers, [7/10] isolates transferred enterotoxin and trimethoprim resistance simultaneously indicating that they either carry a conjugative plasmids or a non conjugative enterotoxin plasmids coexisted with a conjugative cryptic plasmids. Our results predict that enterotoxigenic E. coli. [ETEC], particularly those producing only LT may no longer be restricted to a narrow range of [O] sero- types in the near future
Asunto(s)
Humanos , Plásmidos/análisis , Enterotoxinas/análisis , Métodos EpidemiológicosRESUMEN
The sera of 300 blood donors of Alexanderia Military Traning Centers of about 20 to 25 years old were examined for HBsAg, anti HCV and HIV antibodies using Enzyme Linked Immunosorbent Assay [ELISA]. Liver function tests [SGOT and SGPT] were also done. It was found that all sera were negative for HIV, 11.3% were positive for HBsAg, 6.6% were positive for anti HCV and 2% were positive for both HBsAg and HCV. The enzymes SGPT and SGOT were elevated in subjects with positive HBsAg and/or anti HCV. Results suggest that screening blood donors for anti HCV will reduce the risk of transfusion associated hepatitis
Asunto(s)
Humanos , Hepatitis B/epidemiología , Hepatitis C/epidemiología , Infecciones por VIH/epidemiología , Hepatitis B/inmunología , Hepatitis C/inmunología , Infecciones por VIH/inmunologíaRESUMEN
penicillin tolerance was elicited in 12 of 30 stratns of vitidans streptococci isolated from the mouths of 32 healthy subject Streptococcus sanguis were the organisms most frequently tolerant but the property was also common among isolates of S. mutans, and S. mitior, S. Salivarius was rarely tolerant. When incubated with penicillin at 5 chi MIC, both tolerant and sensitive strains of oral streptococci declined in number less rapidly than S. pyogenes