CASE HISTORY
A four-year-old boy,Evan,was admitted to the hospital to evaluate and treat persistent pain in the rectal area.His problem began about one week earlier with ill-defined pain in the same region.He had a white blood cell count of 24,900 with 87% granulocytes (neutrophils).An abdominal computed tomography scan revealed an abscess (walled-off region of infectious bacteria)next to his rectum.A needle aspiration of the abscess drained 20 milliliters of yellowish,foul-smelling fluid.The specimen was plated on blood agar under aerobic conditions,but the culture was negative despite evidence of bacteria in the abscess drainage.(Blood agar is a rich medium containing 5% sheep red blood cells. )
Which statement regarding specimen collection is FALSE?

Question

Quizplus · Accepted Answer

Sterile body site samples, such as blood, cerebrospinal fluid, or abscess fluid, are typically not contaminated by normal flora, making the use of selective media not always necessary. Selective media are designed to suppress the growth of unwanted bacteria and help isolate the desired organisms, which is more relevant for samples from nonsterile sites where a mixture of organisms, including normal flora, might be present. In the case of sterile body sites, the primary concern is often to culture any bacteria present, not to select for or against specific types.

CASE HISTORY a Four-Year-Old Boy,Evan,was Admitted to the Hospital to Evaluate and Evaluate