Aim: Detection of the interface between etiological agents of bacteremia and epidemiology.
Methods: A total of 164 blood samples were collected from patients infected by bacteremia in King Khalid University Hospital, Riyadh, Saudi Arabia. Special bottles of BACTEC/ALERT PF microbial detection System (BIOMÉRIEUX brand) were used as blood culture bottles with antimicrobial removal systems. Bacterial species were identified using cultural, morphological and standard biochemical tests e.g. the oxidase, catalase and Indole tests.
Results: Elderly category of age was the highest (38.3%), compared to the adult's category (33.2%), then came the other categories (infants, pediatrics, teenagers) which were statistically equal (13.2, 11.0, and 4.3% respectively). The average of infected people in an Inpatient Departments (38.7%) was higher incorporeal than infected people in an Outpatient Departments (11.3%). Identification of bacterial genus and species according to the biochemical definition prospects was carried out in Hospital's Bacteriology Lab. Pathogens were identified in 173 organisms of Gram Positive, Gram Negative bacteria and yeasts. The patients can be infected by one or more than one pathogenic bacteria. The statistical analysis showed a non significant difference between the infected patients by either G ve or G+ve in both males and females.
Conclusion: Patients can be infected by one bacterium, more than one bacterium or yeast. E. coli and Staphylococcus sp. exhibited significant differences in comparison with other genera (G^-ve and G+ve respectively) isolated from blood.

Keyword:Epidemiology, Etiology, age categories, Bacteremia, E. coli, Staphylococcus

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