Gram-negative bacteria are harder to kill because of their harder cell wall. When their cell wall is disturbed, gram-negative bacteria release endotoxins that can make your symptoms worse.

Some gram-negative bacilli, or GNB, are inherently resistant to certain antibiotics. Others acquire resistance spontaneously due to random mutations, as well as by transference of resistance genes ...

Exposure of gram-negative bacilli to paper disks containing penicillin G produced variable results. Data obtained from examination of aerobacter and Esch. coli by this method are presented in Table 2.

Charles F. T. Snelling, Allan R. Ronald, Claudette Y. Cates, William C. Forsythe, Resistance of Gram-Negative Bacilli to Gentamicin, The Journal of Infectious Diseases, Vol. 124, Supplement. Second ...

This article discusses Gram-positive and Gram-negative bacteria. It also outlines their differences, the infections they cause, and discusses antibiotic resistance.