Digitally-colorized scanning electron micrograph (SEM) depicts two mustard-colored, rod-shaped carbapenem-resistant
Klebsiella pneumoniae (CRKP) bacteria interacting with a green-colored, human white blood cells (WBC) known specifically
as a neutrophil.

Please see the Flickr link for additional NIAID photomicrographs of various bacteria.

Klebsiella is a type of Gram-negative bacteria that can cause different types of healthcare-associated infections, including
pneumonia, bloodstream infections, wound or surgical site infections, and meningitis. Increasingly, Klebsiella bacteria have
developed antimicrobial resistance, most recently to the class of antibiotics known as carbapenems. Klebsiella bacteria are
normally found in the human intestines (where they do not cause disease). They are also found in human stool (feces).

In healthcare settings, Klebsiella infections commonly occur among sick patients who are receiving treatment for other
conditions. Patients whose care requires devices like ventilators (breathing machines) or intravenous (vein) catheters,
and patients who are taking long courses of certain antibiotics are most at risk for Klebsiella infections. Healthy people
usually do not get Klebsiella infections.