Microbiology - Meet the Bacteria!

This flashcard covers key vocabulary related to pathogenic bacteria in veterinary microbiology.

pathogenic gram positive coccie

staphylococcus, streptococcus, enterococcus

where does staphylococcus come from

normal flora on skin surface

what pathology/disease is staphylococcus associated with 

found in pyogenic lesions 

morphology and arrangement - staphylococcus

grapelike clusters

testing and identification - staphylococcus

catalase - positive

coagulase - positive group

which staphylococcus species has a high incidence of antimicrobial resitance 

MRSA, MRSI, MRSP

true or false

all staphylococcus species should be tested for antimicrobial susceptibility

true

where does streptococcus come from

normal flora of skin, GI tract, and genitals

what pathology/disease is associated with streptococcus 

pyogenic infections and mastitis

s. equi causes strangles in horses m

morphology and arrangement - streptococcus

cocci noted singly, in pairs, or short chains

testing and identification - streptococcus

catalase - negative

coagulase - positive

beta hemolysis - pathogenic

where do enterococcus sp come from 

normal flora of the GI tract 

what pathology/disease is associated with enterococcus sp

UTI, Endocarditis, cellulitis, wound infection

morphology/arrangement - enterococcus

cocci noted in pairs or chains

testing and identification - enterococcus 

catalase - negative 

alpha or gamma hemolysis 

spore forming - gram positive bacilli

bacillus spp

clostridium spp

small rods - bacilli

listeria monocytogenes

where does bacillus come from 

soil, environment 

pathology/disease associated with bacillus

b. anthracis - anthrax

b. cerus - mastitis

morphology and arrangement - bacillus

varies

testing and identification - b. cerus 

catalase positive

oxidase negative 

where does clostridium come from

C soil, environment

pathology/disease associated with clostridium

potent toxins, c. perfringens

potent toxins associated with clostridium 

botulinum, tetanus, perfringens 

signs associated with c. perfringens

isolated from deep wounds with extensive tissue necrosis

enteritis and diarrhea in dogs and cattle

morphology and arrangement associated with clostridium

bacilli, arrangement varies

testing and identification - c. perfrinigens 

double zone delta hemolysis 

catalase negative 

oxidase negative 

where does listeria monocytogenes come from

contaminated water and soil

pathology/disease associated with listeria

circling disease in ruminants

septicema

abortions

morphology and arrangement - listeria monovytogenes 

long thin rods in short chains 

testing and identification - listeria monovytogenes

only gram - positive rod motille at room temperature

catalase positive

oxidase negative

pathogenic gram negative bacilli

salmonella sp

proteus sp

pasterurella sp

pseudomonas sp

brucella sp

pathogenic gram negative bacilli - coliforms 

e. coli

klebsiella 

where does escherichia coli come from

GI flora

pathology/diseases - escherichia coli

diarrhea in neonates, UTI

morphology/arrangement - Escherichia coli 

short bacilli 

testing/identification - escherichia coli

motile, catalase positive, oxidase negative, strong lactose fermentation on macconkey agar

what toxin is responsible for foodborne human illness

shiga toxin

where does klebsiella pneumoniae come from 

K GI flora 

pathology/disease = Klebsielal pneumoniae

mastitis, pneumonia, UTI

morphology/arrangement - klebsiella pneumoniae

bacilli single, short chains, or pairs

testing/identification - klebsiella pneumoniae 

gamma hemolysis - none

catalase positive

oxidase negative