Microbiology Flashcards
Examples of gram positive cocci
Staphylococci
Streptococci
Enterococci
Examples of gram negative cocci
Neisseria menningitidis
Gonorrhoeae
Moraxella catarrhalis
Examples of positive bacilli
(rod shaped) Clostridia Corynebacteria Bacillus Listeria Mycobacteria Nocardia Actinomycetes
Structural differences between gram positive and negative
positive = thick cell wall, no outer membrane negative = thin cell wall, outer membrane
Examples of gram negative bacilli
Enterobacteria Pseudonomads Leigonella Anaerobic gram negative rods cocco-bacilli
What are mycoplasma?
Lack cell walls
What are spirochaetes
spiral specialised flagella in outer membrane which spin - treponema - borrelia - leptospires
What are ricketssiae
- small
- outer membrane
- arthropods transmit
- reproduce within host cells
- rickettsiae
- coxiella
What is chlamydia
- small
- EC and IC
- only replicate within host cells
Streptococcus
gram positive
grows in chains on blood agar
catalase negative
Enterococcus
gram positive
commensal in gut rather than skin
Abiotrophia
NVS = nutritionally variant streptococci
endocarditis
higher morbidity and mortality as poor response to antimicrobials
Staphylococcus
gram positive
grows in clumps on blood agar
commensal on skin
catalase positive
Pepto-streptococcus
gram positive
commensal in mouth and skin
obligate anaerobe
occasionally causes pathology
