Master Yersinia Enterocolitica with Picmonic for Medicine

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Yersinia Enterocolitica

Ear-scientist with Intestine-castle
Picmonic
Yersinia enterocolitica is a gram negative bacilli that can cause GI disease and is most frequently linked to ingestion of pork, raw milk, and contaminated water. Yersinia enterocolitica can also be linked to contact with infected pet feces and spreads easily in daycare centers. Infections preferentially involve the ileum, appendix, and right colon. Individuals infected with Y. enterocolitica generally present with abdominal pain but fever and bloody diarrhea may also occur. The organisms multiply in mesenteric lymph nodes and can lead to mesenteric adenitis or granulomatous microabscesses in the lymph tissue. The involvement of the regional lymphatics can mimic acute appendicitis in teenagers and young adults. There have been reports of post infectious complications of Reiter’s disease, now called Reactive arthritis. 
14 KEY FACTS
CHARACTERISTICS
Gram-Negative
Graham-cracker Negative-devil

Yersinia is a Gram-negative bacteria that does not stain when crystal violet dye is applied, due to much thinner peptidoglycan layer.

Bacilli
Rod

This bacteria is rod shaped.

Non-lactose Fermenting
Nun-milk-carton Ferns

Yersinia enterocolitica is characterized as a lactose nonfermenter because it cannot utilize lactose sugars in culture. The bacteria grow as white or colorless colonies on MacConkey agar, which is used to test for lactose fermenting capability.

Non-H2S Producing
Nun with H-shaped Sulfur-match

Yersinia enterocolitica does not produce H2S (hydrogen sulfide), which allows it to be differentiated from other oxidase negative Gram-negative bacteria, like Salmonella and Proteus.

Oxidase-Negative
Wilting Ox-daisy

The oxidase test is used to determine if a bacterium produces certain cytochrome C oxidases in order to use oxygen for energy production.Yersinia enterocolitica is oxidase- negative, meaning it does not use the electron transport chain to make energy.

Day Care Centers
Day care kids with toys

Children at daycare centers are at higher risk for infection due to fecal-oral contact.

Pork
Pig

This bacteria is most frequently linked to ingestion of pork, raw milk and contaminated water.

Raw Milk
Cow udders

This bacteria is most frequently linked to ingestion of pork, raw milk, and contaminated water.

Pet (Puppy) Feces
Dog poop

Yersinia enterocolitica can be linked to contact with infected pet feces.

SIGNS AND SYMPTOMS
Bloody Diarrhea
Red Toilet

Individuals infected with Y. enterocolitica generally present with abdominal pain, but fever and bloody diarrhea may also occur.

Mesenteric Adenitis
Mesentery Add-knights

Mesenteric adenitis is inflammation of the mesenteric lymph nodes.

Granulomatous Microabscess in Mesenteric Lymph Nodes
Granny llama with Abscess-guy and llama eating a Lymph-lime

The organisms multiply in mesenteric lymph nodes and can lead to granulomatous microabscesses in the lymph tissue. The granulomatous response can create diagnostic confusion with Crohn's disease.

Pseudoappendicitis (Mimics)
Appendicitis-pen Mime

The involvement of the regional lymphatics can mimic acute appendicitis in teenagers and young adults.

Reiter's Syndrome or Reactive Arthritis
Writer-King-Arthur

Reiter's syndrome is another name for reactive arthritis. Reactive arthritis is an autoimmune condition that typically develops after an infectious process.The clinical pattern consists of inflammation of the joints, inflammation of the eyes and urethritis. Yersinia enterocolitica has been linked to reactive arthritis.

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