Which type of bacteria is characterized by penicillin resistance in the Enterobacteriaceae family?

The selected answer highlights that both Escherichia coli and Klebsiella pneumoniae are characterized by penicillin resistance within the Enterobacteriaceae family. This is accurate because both of these bacteria can produce enzymes, specifically β-lactamases, which confer resistance to penicillin and other β-lactam antibiotics.

Escherichia coli, particularly certain strains, has shown a rising trend of resistance to penicillins, especially in healthcare settings where antibiotic use is prevalent. Klebsiella pneumoniae is notable for its well-established resistance mechanisms, including the production of extended-spectrum β-lactamases (ESBLs) and carbapenemases, making it one of the significant pathogens associated with antibiotic resistance.

Thus, identifying both organisms as contributors to penicillin resistance within the Enterobacteriaceae family illustrates the broader challenge of antibiotic resistance that healthcare facilities must address. This knowledge is crucial for understanding infection control strategies and treatment options in nursing homes and other healthcare settings.