Intestinal bacteria Flashcards
List the important genera of the phyla firmicutes
Gram +ve:
- listeria
- staphylococcus
- enterococcus
- lactobacillus
- streptococcus
Gram +ve endospore forming:
- clostridium
- bacillus
Lacking cell wall:
- mycoplasmas
What are the important genera in the phylum bacteroidetes?
Gram -ve:
- bacteroides (abundant in faeces)
- porphyromonas (oral cavity)
What are the important subgroups of proteobacteria?
Gammaproteobacteria
Epsilonproteobacteria
What are the important groups of bacteria in the subgroup gammaproteobacteria?
Pseudomonadaceae:
- pseudomonas
Enterobacteriaeae:
- salmonella
- E. coli
Describe the bacteria in the subgroup epsilonproteobacteria
Gram -ve
Vibrio
Microaerophilic
Helicobacter spp
Campylobacter spp
Describe the bacteria in the phylum actinomycetota
Acid fast:
- mycobacteria
Gram +ve:
- corynebacterium
- bifidobacterium (commensal of GIT)
Describe bifidobacterium
Gram +ve
rod
anaerobes
common commensal bacteria
ferment carbs/oligosaccharides
Fill in this table on the common genera found in the GIT
Describe the genus bacteroides
Major components of mammalian GI flora
Gram -ve bacilli
Anaerobes
Non-endospore-forming
Describe the genus lactobacillus
Gram +ve
facultative anaerobe/microaerophilic
Convert lactose and other surgars to lactic acid
Present on mucosa of GI and repro tract
How does lactobacillus bacteria benefit the host?
Production of lactic acid makes environment acidic => inhibits growth of some harmful bacteria
Describe the genus streptococci
Gram +ve
coccoid
facultative anaerobes
Opportunistc
What bacteria causes mastitis?
Streptococci uberus
Intestine is reservoir
Healthy in gut, opportunistic when in faeces
Describe enterococcus species
Gram +ve
facultative anaerobes
commensal
can cause opportunistic infections
Describe the genus clostridia
Gram +ve
Endospore forming
Rods
Obligate anaerobes
