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4 years old male child was brought to the ER with complaints of pain in the right knee joint for 2 days. he was limping . on examination the joint was edematous ,erythematous and tender to touch. child was febrile and complained of chills. joint aspirate has shown leukocytosis , predominantly neutrophils. father tells that child was adopted at 2 yearsof age and the immunization status is not known.which is the most likely organism to have caused the child's illness?

a.staphylococcus aureus
b.Group A Streptococcus
c.Group B streptococcus
d.Haemophilus influenza
e.streptococcus pneumoniae
f.Group D Streptococci


a.staphylococcus aureus


IN AN UN-IMMUNIZED CHILD , heamophilus influenza is the COMMONEST CAUSE OF SEPTIC ARTHRITIS. since the vignette clearly tells that child's immunization stattus is not known, hemophilus influenza is the answer. if the immunization status is complete, then STAPHYLOCOCCUS AUREUS IS THE COMMONEST CAUSE.


then what is the answer , i m vvv confused, some say salmonella, some say s aures, plz if any one could clarify


no doubt. the most common cause of septic arthritis is Staph. aureus except ages between 2-4 which the most common cause is H.inf. type B.


is it b?


staph ?


S. Aureus.


the most likely - staphylococcus aureus
Immunization status unknown - doesn't mean child is unimmunized.

In all age groups, the most common infecting organism is Staphylococcus aureus.

In the past, H influenzae was the dominant pathogen causing septic arthritis in children younger than 3 years.

The points on treatment -
- Treat children older than 4 years with a penicillinase-resistant penicillin alone.
- For children 4 years of age or younger who have not been vaccinated against H influenzae type b, add coverage for ampicillin-resistant strains of H influenzae.

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