Definition
*Klebsiella* are Gram-negative bacteria that can cause infections in various parts of the body. *Klebsiella pneumoniae* is the most common species, often leading to pneumonia, bloodstream infections, and urinary tract infections. These bacteria are typically found in the environment, like soil and water, as well as on human skin and in the intestines. Think of *Klebsiella* as being sneaky invaders, thriving when the body's defenses are down. They are opportunistic pathogens, meaning they seize the opportunity to infect when the immune system is weakened. So, it's best to keep your defenses up!