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Microbiology

Difference between Streptococcus Pneumoniae and Streptococcus Viridans

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Disclaimer:

The treatment offered here is for medical professional’s note and not a prescription for a specific patient. Don’t take medicines without a doctor’s prescription. Incorrect medication can cause severe health issues and even death.

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Remember that S. Pneumonia is a single species while S. Viridans is a large group of species.

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Category

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Morphology

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S. Pneumoniae

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Lancet shaped

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S. Viridans

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Elongated, oval, or rounded

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Capsule

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Present

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Absent

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Quellung Test

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Positive

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Negative

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Gram Stain

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Gram positive

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Gram positive

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Bile Solubility

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Soluble

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Insoluble

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Optochin Sensitivity

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Sensitive

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Resistant

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Hemolysis

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Beta hemolytic

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Alpha Hemolytic or non hemolytic

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Lancefiled Class

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None

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None

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Important Diseases

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C-MOPS.

Conjunctivitis

Meningitis

Otitis Media

Pneumonia

Sinusitis

Penicillin (resistance is common 40%
or more patient are resistant)

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Subacute infective endocarditis (SBE)

Dental Carries

Liver and Brain Abscesses

SBE (S. Viridans)

IV Benzyl Penicillin 1.2 g 6 times daily

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Treatment

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Ceftriaxone (not in children < 2 years)

Cefotoxime in children < 2y
Vancomycin

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4 weeksIV Gentamicin 1 mg/Kg 3 times daily

2 to 4 weeks Mind the penicillin allergies.

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Here is a visual mnemonic for you. Can you find the two pathogens?

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By Drbeen

Improving healthcare...one clear concept at a time!

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