What is the main factor in pathogenesis of a pseudotuberculosis?
The enteropathogen, Yersinia pseudotuberculosis, requires a large inoculum to produce the disease. The primary virulence factor is a plasmid-encoded protein that causes increased invasiveness. Yersinia pseudotuberculosis survives intracellularly.
How did Yersinia pestis evolve?
pestis emerged <6000 years ago from an enteric bacterial ancestor through events of gene gain and genome reduction. It is a highly remarkable model for the understanding of pathogenic bacteria evolution, and a major concern for public health as highlighted by recent human outbreaks.
Which Yersinia species did Yersinia pestis evolve from?
Yersinia pestis, the causative agent of bubonic, pneumonic and septicaemic plague, evolved from the closely related environmental progenitor Y. pseudotuberculosis1.
Is Yersinia psychotropic?
Yersinia enterocolitica is a psychotropic bacterium, which causes acute gastro-enteritis and occasionally more serious disease in humans.
What makes Yersinia pestis unique?
pestis is unique in being carried by fleas and is transmitted when the flea bites a new animal host. Y. pestis blocks the digestive tracts of fleas by forming biofilms. This provokes the starving fleas to bite repeatedly in a futile attempt to obtain food, and thus infect new hosts.
Did the bubonic plague mutate?
The Black Death — the dreaded plague that killed millions of people during the Middle Ages — only reached pandemic status after the bacteria that cause it acquired two pivotal mutations, a new study finds.
How many genes does Yersinia pestis have?
150 pseudogenes
The genome contains around 150 pseudogenes, many of which are remnants of a redundant enteropathogenic lifestyle. The evidence of ongoing genome fluidity, expansion and decay suggests Y.
What type of pathogen is Yersinia?
bacterium
Yersinia enterocolitica is a gram-negative bacillus shaped bacterium that causes a zoonotic disease called yersiniosis. The infection is manifested as acute diarrhea, mesenteric adenitis, terminal ileitis, and pseudoappendicitis. In rare cases, it can even cause sepsis.