Lecture 8 and 9 Flashcards
Stain and shape of Enterobacteriaceae organisms
GramNeg
Rods
All have capsule (very large in Klebsiella)
O2 requirement of enterobacteriaceae
Facultatively anaerobic
How do enterobateriaceae move
Either peritrichous flagella or are nonmotile
O-antigens are what?
Part of LPS
H antigens are what?
Flagella
K/Vi antigens are what?
Capsular type
What is the main cause of foodborne illnesses?
Bacteria
What tests can you use for enterobacteriaceae
IMViC
Carbohydrate metabolism
What is IMViC
A test to identify a type of bacteria from the coliform group
What is enterotube?
A test tube to identify different enterobacteriaceae
What is unique about gut bacteria and how sense hormones?
They can response to stress-induced hormones levels (tells them this is a good time to attack)
Why do bacteria often go undetected in the body?
Many can block signaling pathways that would signal their presence
What is unique about pathogenic E. coli?
They never enter the cell but they produce protein that can facilitate entry of other bacteria and survival in a cell
What are the three diseases associated with E. coli?
Enteric
UTI
Sepsis/meningitis
What antigens are present on enterobacteriaceae
O
H
K/Vi
How can you detect E. coli in the lab?
All lac+
Copious acid production
Detected by green metallic sheen on EMB agar
What type of E. coli causes UTIs?
Uropathogenic E. coli
What type of E. coli causes sepsis and meningitis?
Meningitis associated E. coli
Why is E. coli the most common cause of UTI?
Proximity of anus to urethra
Uropathogenic E. coli interact with blood how?
Have “P” pilus will faciliates blood cell binding
How many types of diarrhea are caused by E. coli?
5
EPEC (EPEC) do what?
Bundle in the intestine against microvilli
Inhibit water uptake
EPEC stands for?
Enteropathogenic E. coli
Who can get EPEC?
Young children