Are all streptococcus lanceolated? or all ovoid? We got Strep pyogenes, Strep agalactiae, Enterococcus faecalis, Strep...

Are all streptococcus lanceolated? or all ovoid? We got Strep pyogenes, Strep agalactiae, Enterococcus faecalis, Strep bovis, Viridans strep, Strep pneumoniae. Can someone help me with the colony morphology of each one? like which one is in chains and which are in pairs? and which are ovoid and which are lanceolated?

Expert Solution

Strep pyogens	It is a round or ovoid shaped gram positive,non motile ,non sporing pus forming bacteria.It links in a chain of round cells.It can grow in the absence of oxygen.Growth is stimulated by incubating in CO2 environment.It stains purple when gram stain method is used.
Strep agalactiae	It is a gram positive coccus round or ovoid bacteria. It has a tendency to form chains.It requires an enriched medium.older cuture loses its gram positive nature
Enterococcus faecalis	It is a gram positive, ovoid,non motile microbe found in pairs or short chains.Forms a alpha hemolytic colony.
Strep bovis	It is a gram positive bacteria, occurs in pairs or in chains.When incubated with aflatoxin B1 grew in long chains whereas cells in control culture where doublets
Viridans strep	This is gram positive bacteria, ovoid.They are alpha hemolytic producing green coloration on blood agar.
Strep pneumoniae	It is a gram positive,lancet shaped diplococci non motile. Hemolytic colonies appears raised in 1 to 2 days where the colonies are flattened with depressed center and is called as draughtsman colony.When cultured on blood agar they are alpha hemolytic

Nightingale answered 1 year ago

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