Opportunistic diseases Enterobacteriaceae septicemia, pneumonia, meningitis urinary tract infections Citrobacter Enterobacter Escherichia Hafnia Morganella Providencia Serratia– septicemia, – pneumonia, – meningitis – urinary tract infections Citrobacter Enterobacter Escherichia Hafnia Morganella Providencia Serratia Opportunistic diseases -Enterobacteriaceae