What is the implicated illness of Yersinia?
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.
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Who discovered Yersinia enterocolitica?
Alexandre Yersin
YERSINIA ENTEROCOLITICA (YE) pestis is the cause of the plague and was discovered by Alexandre Yersin [1863–1943] in 1894. YE is an intestinal pathogen and causes enterocolitis after an incubation time of 4–7 days. It can cause abdominal pain due to mesenteric enteritis, and is a self-limiting disease.
Where is Yersinia Aldovae found?
Yersinia aldovae is a species of bacteria that was originally described as Group X2 Yersinia enterocolitica. Its type strain is CNY 6005 (= CDC 669-83 = ATCC 35236). Y. aldovae has been isolated from aquatic environments and soil, but it has not been associated with animal or human illnesses.
What tests would you do to confirm the identification of Yersinia pseudotuberculosis?
DNA colony hybridization and PCR tests can be used to confirm the presence of these genes related to pathogenicity in isolated strains from food samples (16, 35, 38). Y. pseudotuberculosis is less ubiquitous than Y.
Is Yersinia Gram positive or negative?
Gram-negative bacilli
Yersinia pestis — Gram Stain Gram-negative bacilli (0.5 to 0.8 by 1 to 3 microns), single or short chained. Sometimes bipolar staining (“closed safety pin”).
How common is yersiniosis?
How common is yersiniosis? CDC estimates that infections with Yersinia enterocolitica cause almost 117,000 illnesses, 640 hospitalizations, and 35 deaths in the United States every year. Children are infected more often than adults, and the infection is more common in the winter.
What is the morphology of Yersinia?
Major characteristics of Yersinia pestis: Gram stain morphology: Gram negative rods, 0.5 x 1-2 µm Colony morphology: Slow growing, pinpoint colonies after 24h; colonies are 1-2 mm, gray-white to slightly yellow and opaque on BAP after 48 h; non-lactose fermenter on MAC/EMB; growing both at 25-28°C and at 35-37°C.
Where does the name Yersinia come from?
The genus is named for French bacteriologist Alexandre Yersin, who in 1894 discovered Pasteurella pestis (now Yersinia pestis), the causative agent of plague, which was independently isolated that same year by Japanese physician and bacteriologist Kitasato Shibasaburo.
How is Yersinia diagnosed?
Yersiniosis usually is diagnosed by detecting the organism in the stool of an infected person. Many laboratories do not routinely test for Yersinia, so it is important to notify laboratory personnel when yersiniosis is suspected so that special tests can be done.
What is morphology of Yersinia pestis?
How do you identify Yersinia pestis?
Characteristics: Direct microscopic examination of specimens and cultures by Gram stain can provide a rapid presumptive identification. Stained specimens containing Y. pestis often reveal plump, gram-negative rods, 1–2 µm X 0.5 µm, that are seen mostly as single cells or pairs and short chains in liquid media (Fig.
What does yersiniosis look like?
The symptoms of yersiniosis depend on the age of the person infected. Infection occurs most often in young children. Common symptoms in children are fever, abdominal pain, and diarrhea, which is often bloody. Symptoms typically develop 4 to 7 days after exposure and may last 1 to 3 weeks or longer.
What is the cause of yersiniosis?
Yersiniosis is an infectious disease caused by enteric bacteria of the genus Yersinia. In the United States, most human illness is caused by one species, Y. enterocolitica.
How is Yersinia pestis cultured?
Culture Characteristics: Growth at 22-25oC and at 35oC. Organism prefers 25oC, so the colonies will grow faster at this temperature. Growth occurs on most routine media, including sheep blood agar (SBA), chocolate agar (CHOC), MacConkey (MAC) agar, and routine blood culture media. Non-lactose fermenter on MAC agar.
What does Yersinia pestis look like?
pestis grows as gray-white, translucent colonies, usually too small to be seen as individual colonies at 24 h. After incubation for 48 h, colonies are about 1–2 mm in diameter, gray-white to slightly yellow, and opaque.
What is Yersinia culture?
Yersinia pseudotuberculosis causes belly (abdominal) pain similar to appendicitis. Yersinia pestis causes the disease known as the plague. A stool culture may be used to diagnose Y. enterocolitica and sometimes Y. pseudotuberculosis.
What are the characteristics of Yersinia pestis?
Gram-negative bacilli, possible bipolar staining and a “safety pin” appearance. Growth is faster at 25 to 28 degrees C than at 35 to 37 degrees C. At 48 to 72 hours the colonies on sheep blood agar have a “fried egg” appearance.