However, C.tertium does not grow on selective media for gram-negative organisms.

More gram-positive than gram-negative organisms were isolated from the blood stream of our subjects.

Our finding of E coli to be the most common gram-negative organism differs from findings in previous studies.

It has antibiotic activity against a wide range of Gram-negative and Gram-positive organisms.

It also proved effective against a number of so-called gram-negative organisms, including those that cause typhoid, tularemia and plague.

Cefaclor is active against many bacteria, including both Gram-negative and Gram-positive organisms.

Such stability to β-lactamases increases the activity of cefotaxime against otherwise resistant Gram-negative organisms.

Beta-lactamases produced by Gram-negative organisms are usually secreted, especially when antibiotics are present in the environment.

Most pathogenic bacteria in humans are gram-negative organisms.

There, a screening test revealed that it produced a novel molecule that acted against gram-negative organisms.