Microbiology 2: G.I Infections Flashcards
Name 3 organisms that cause an inflammatory diarrhoea ?
Campylobacter. Jejuni
Shigella.spp
Non-typhoidal salmonella serotypes
Name an organism that causes a secretory diarrhoea ?
Vibrio cholerae
What is the difference between secretory and inflammatory diarrhoea ?
Inflammatory diarrhoea also has a fever and white blood cells in stool sample
Which bacteria is commonly found in re-heated fried rice ?
B.Cereus
List the 3 Cs of antibiotics commonly responsible for causing Pseudomembranous colitis ?
Cephalosporins
Ciprofloxacin
Clindamycin
Name 2 drugs used to treat Pseudomembranous colitis ?
Metronidazole
Vancomycin
Which organism present in refrigerated food causes gastroenteritis with fever and particularly affects pregnant women ?
Listeria monocytogenes
Which organism is commonly responsible for traveler’s diarrhoea ?
ETEC- Etoxogenic E.Coli
Young child visited petting farm and now presents with haemorrhagic stools and Renal failure.
Which organism is responsible?
EHEC - haemoragic E.Coli 0157:H7
Which organism is found in raw seafood and commonly causes self limiting diarrhoea in japan ?
Vibrio. Parahaemolyticus
Which organism causes cellulitis In shellfish handlers which can cause fatal septicaemia ?
VIbrio. Fulnificus
Which comma shaped bacteria can cause abdominal pain and watery diarrhoea and is commonly transmissited by eating BBQ meat ?
Campylobacter
Which protozoal organism with 4 nuclei present in unboiled water causes “flask-shaped” ulcers, tenesmus, RUQ pain, dysentery and liver abscesses ?
Entamoeba. Hystolytica
Which Protozoal organism causes severe diarrhoea in the immuno compromised and is diagnosed by the presence of Oocysts in the stool seen by staining with Modified Kinyoung acid fast stain ?
Cryptosporidium.Parvum
Which dsRNA “wheel shaped” virus causes secretory diarrhoea in children ?
Rotavirus
Which virus causes outbreaks and often requires hospital wards to be closed?
Norovirus
Which virus causes non bloody diarrhoea in <2 year olds or immunocompromised patients ?
Adenovirus
List 2 ways that Salmonella is commonly transmitted ?
Eating infected meats (often raw chicken)
Reptiles (you often see recurrent infections)
List differences in the presentation of Salmonella enteritidis and Salmonella typhi ?
Enteritidis: non-bloody Diarrhoea, no fever, self-limiting, stool culture +ve
Typhi: Constipation, typhoid fever, can cause bacteraemia, affects sickle cell patients more, splenomegally and rose spots, blood culture +ve
What is dysentery ?
Infection of the intestines resulting in severe diarrhoea with blood and mucous
Name a gram possitive coccus bacteria that causes food poisoning ?
S.aureus
Name an organism that affects the ileum, appendix and colon. It invades peyer’s patches leading to mesenteric lymph node enlargement with necrotising granulomas. Complication can include peritonitis, pharyngitis and pericarditis.
Yersinia
Which organism causes “rice water stools” ?
Cholera
Which organism causes an afebrile, explosive diarrhoea and vomiting, abdominal pain and bloating, steatorrhea with cysts in the stool ?
Giardiasis
Which organism causes a rapid onset of nausea and vomiting after eating buffet ham. Thought to be due to a heat stable preformed toxin ?
S.aureus
S-shaped microaerophillic bacteria in stool culture ?
Campylobacter
Which gram -ve bacteria often gives rise to travellers diarrhoea ?
E.Coli
Which organism often found in refrigerated food or unpasteurised dairy products shows “tumbling motility” on microscopy and can cause gastroenteritis outbreaks ?
Listeria Monocytogenes
Pregnant women need to be careful with eating soft cheeses. Neonates and immunocompromised are especially susceptible and can get sepsis, meningitis and encephalitis.
Which organism can cause HUS ?
EHEC 0157:H7
Which ‘comma’ organism is responsible for profuse watery diarrhoea ?
V.Cholerae
Which organism is “pear shaped” and causes foul smelling steatorrhoea with cysts visible on microscopy ?
Giardia Lamblia
Which bacteria transmitted via dog faeces can cause complications such as GBS and Reiter’s syndrome ?
Campylobacter Jejuni
Which organism can cause watery diarrhoea + abdominal cramps after eating reheated meats? This organism can also cause gas gangrene and mainly acts on the small bowel.
Clostridia Perfringens
Which organism mainly affects the distal ileum and colon causing a fever and painful, bloody diarrhoea ?
Shigella
