Urban stream microbial communities show resistance to pharmaceutical exposure
Residues of pharmaceuticals are increasingly detected in surface waters throughout the world.In four streams in Baltimore, Maryland, USA, we detected analgesics, stimulants, antihistamines, andantibiotics using passive organic samplers. We exposed biofilm communities in these streams to the com-mon drugs caffeine, cimetidine, ciprofloxacin, and diphenhydramine.