Check out this weird culture findings! Sometimes, patients may be taking antibiotics before they collect a sample for a culture. The clearing around at the top of the agar is due to antibiotics present in a urine culture. As the plate is streaked out, the antibiotic is diluted enough where bacteria to grow, but where it is present in the highest concentration, it will kill the bacteria. This can have a huge effect on the culture results including the accuracy for susceptibility testing. #microbi