Generally, ionophore antibiotics are highly effective against Gram-positive bacteria but exhibit little or no activity against Gram-negative bacteria (Chen and Wolin, 1979; Watanabe et al., 1981).
Source: wiktionary
Gram-positive
Synonyms for "gram-positive"
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Note that L.^([Listeria]) monocytogenes is one of the few Gram-positive bacteria against which vancomycin is not effective — hence the need for ampicillin.
Source: wiktionary
The majority of Gram-positive (82%) and Gram-negative (64%) genera carry either ribosomal protection genes alone or in combination with efflux/enzymatic genes as illustrated in Table 7.2.
Source: wiktionary