Klebsiella pneumoniae is a member of the genus Klebsiella enterobacteriaceae, a gram-negative bacterium, rod-shaped, and coated with a large number of sticky polysaccharides. Klebsiella pneumoniae can cause infectious diseases such as pneumonia, urinary tract infection, bacteremia, etc. in humans, especially individuals with low immunity. The infections are more common in hospitals. However, in addition to hospital infections, community-based infection also gradually increased.
Klebsiella pneumoniae is highly pathogenic to humans and is one of the important conditional pathogens and iatrogenic infections. In hospital-infected sepsis, this bacterium is one of the important pathogenic bacteria with a high mortality rate.
Recent studies in the medical community have found that, because this bacterium is very susceptible to mutation, it is more resistant to drugs, and its harmfulness to human health has also increased year by year.
In the community, the carrier rate of Klebsiella pneumoniae in fecal specimens was between 5% and 38%, and between 1% and 6% in the nasopharynx. The carrier rate in hospitalized patients increased significantly, and the fecal carrier rate was 77% The pharyngeal infection rate was 19% and the hand infection rate was 42%. 
1. Clin Microbiol Rev. 1998;11(4):589.