Yersiniaceae

The Yersiniaceae is a family of Gram-negative bacteria within the order Enterobacterales. This family includes several genera, with Yersinia being the most notable due to its historical and medical significance. Members of this family are characterized by their rod-shaped morphology and facultative anaerobic metabolism.

Taxonomy

The Yersiniaceae family was established based on phylogenetic analyses that reclassified certain genera from the larger family Enterobacteriaceae. The reclassification was proposed by Adeolu et al. in 2016, who used genomic data to delineate this family from others within the order.

Genera

The family Yersiniaceae includes the following genera:

• Yersinia
• Serratia
• Ewingella
• Rahnella

Pathogenicity

The genus Yersinia includes several pathogenic species, most notably Yersinia pestis, the causative agent of plague. Yersinia enterocolitica and Yersinia pseudotuberculosis are also significant as they cause gastroenteritis and mesenteric lymphadenitis in humans.

Yersinia pestis

Yersinia pestis is a highly virulent pathogen responsible for bubonic plague, septicemic plague, and pneumonic plague. It is transmitted to humans through the bite of infected fleas, direct contact with infected tissues, or inhalation of respiratory droplets from infected individuals.

Ecology

Members of the Yersiniaceae family are found in a variety of environments, including soil, water, and as part of the normal flora of animals. Some species are opportunistic pathogens, while others are free-living.

Clinical Significance

The clinical significance of the Yersiniaceae family primarily stems from the pathogenic species within the genus Yersinia. Infections can range from mild gastroenteritis to life-threatening systemic diseases. Diagnosis typically involves culture and identification of the bacteria from clinical specimens.

Also see

• Enterobacterales
• Gram-negative bacteria
• Bacterial taxonomy
• Plague