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SCHC Microbiology II

microlicious

QuestionAnswer
List general characteristics of enterobacteriaceae. Gram neg rods, catalase pos, oxidase neg, glucose fermenters
What are the surface antigens on enterobacteriaceae? What are they associated with? K--> capsular O-->somatic H-->flagellar
Of the Enterics name the true pathogens. Yersinia, Salmonella, Shigella, and E. coli.
When you see a clear red colony with a black center on XLD, what organism is likely? Salmonella spp.
Enlarged lymphnodes can be caused by which enterobacteraceae? What is the name of the enlarged lymph nodes when associated with this organism? Yersinia pestis, bubo
What is HUS? What organism is associated with this condition and the subgroup of the infection. Hemolytic uremic symdrome; caused by E. coli, EHEC=enterohemorrhagic E. coli.
What strain is associated with EHEC? O157:H7
Name a virulence factor for EHEC Shiga toxin
**add card about sorbitol and o157 ***
How is EHEC transmitted and what is a symptom of the illness. Undercooked ground beef and raw milk (unpasteurized)
What is ETEC? What is it's primary virulence factor? enterotoxigenic E. coli; contains a enterotoxin similar to V. cholerae.
What is the EIEC and what is the main symptom? Enteroinvasive E. Coli; causes dysentery via direct penetration, invasion, and then destruction of intestinal mucosa.
What is the virulence factor of EIEC and what other organism acts similarly? Direct invasion of the enterocytes; similar action in Shigella
What is commonly seen in the stool of people with dysentery? Mucus and blood
ETEC causes what illness? Traveler's diarrhea or childhood diarrhea.
What is EPEC? What is the virulence factor? enteropathogenic E. coli; organism attaches to the cell surface and causes changes in the cell surface.
What is a common symptom in patients with EPEC? Diarrhea with mucoid stools (blood but not large amounts)
WHat is EggEC? What is the virulence factor and the symptoms? enteraggregative E. coli; organism adheres to mucosal surface; watery diarrhea
Which two species of Klebsiella are we concerned with? K. oxytoca and K. pneumoniae
What type of pathogen is K. oxytoca and K. pneumo? What infections can they cause? Opportunistic; causes bacterial pneumonia in alcoholics, wound infections, UTI, bacteremia
What is the colony morphology of klebsiella? very mucoid tot he point that it can drip onto the lid if inverted.
What is the virulence factor for klebsiella? The polysaccharide capsule.
**What drug is klebsiella sp resistant to?** Ampicillin
What kind of infections can enterobacter cause and what type of pathogen is it? wound infections, UTI, bacteremia, meningitis, respiratory tract infections; oppurtunistic.
What drugs are enterobacter species resistant to? Ampicillin + 1st and 2nd generation cephalosporins
Which two species are we concerned with in the clinical lab? E. aerogenes, E. cloace
On the plate which other organism does enterobacter resemble? Klebsiella
What is CIN media selective for? Yersinia
When a disease is transmitted by animals it is called what? Zoonoses
What test can differentiate K. oxytoca and K.pneumo? Indole+ = K. oxytoca Indole- = K. pneumo
What is HE selective for? What does the plate look like when the organism selected for is present? gram-neg non-fermentors; green
Created by: 25109943