Following statement is false regarding Colistin:
It belongs to a group of antimicrobial agents known as polymyxins which were originally isolated from the spore forming soil organism Paenibacillus polymyxa Colistin is a mixture of polymyxin E1 and E2, two bactericidal pentacationic lipopeptide All gram positive bacteria are susceptible to Colistin Colistin is generally used to treat infections with multidrug-resistant, extensively drug-resistant and pan drug-resistant bacteria