The first betalactamases were identified in a species of E.coli in 1940 (1). However, the ability of bacteria to produce enzymes that destroy the b-lactam ring was noted even before penicillin was developed. In fact, many of the gram-negative bacteria possess chromosomally mediated blactamases, which help the bacteria find a niche when faced with competition from other bacteria that naturally p...

Waste water of municipal sewerage system contains several types’ of pathogenic bacteria which can become air borne in case of mechanical disturbance. There is some evidence which indicate that enteric diseases prevailed in communities that may be associated with aerosols generated from waste water containing enteric pathogens. The present aero-bacteriological investigation included enumeration,...