RESUMEN
A study was conducted to test a coagglutination procedure for detection of Salmonella typhi in bone marrow cultures from suspected typhoid patients admitted to Friendship Hospital, Jakarta, Indonesia. The results of the coagglutination tests were compared to the results from standard cultural isolation and identification. Bone marrow aspirates (356) were cultured in oxgall medium and aliquots subcultured daily for 7 days while simultaneously testing for the presence of Salmonella group D and Vi antigens using coagglutination (COAG). S. typhi was isolated from 220 (62%) of the cultures and the D- and Vi-COAG tests were positive for those same cultures. The COAG test was also negative for 6 cultures containing S. paratyphi A. The COAG results were available within 10 minutes after 18 to 24 hours incubation of the primary cultures whereas the isolation and confirmed identification took 2 to 3 days longer. The COAG test is valuable as an aid to rapidly identify S. typhi in bone marrow-oxgall cultures.
Asunto(s)
Pruebas de Aglutinación/métodos , Examen de la Médula Ósea/métodos , Medios de Cultivo , Estudios de Evaluación como Asunto , Humanos , Indonesia/epidemiología , Salmonella typhi/crecimiento & desarrollo , Sensibilidad y Especificidad , Fiebre Tifoidea/diagnósticoRESUMEN
The use of 10% oxgall and bile broth medium, both supplemented with freshly prepared 100 u/ml streptokinase, for isolating Salmonella typhi by clot culture technique was evaluated and compared against whole blood culture systems (3 ml blood in 9 ml media and 8 ml blood in 72 ml media). These gave a 1:4 and 1:10 blood to medium ratio, respectively. Clot cultures in 10% oxgall (CLOX) gave a 57% positive isolation rate for S. typhi. A similar result was obtained from clot cultures in bile broth medium (CLBB). A total of 184 samples identified as positive for S. typhi were tested. There was no significant difference between the use of 10% oxgall or bile broth medium when used for clot culture. The whole blood culture systems still showed a significantly better rate of isolation than the clot culture methods.