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Review Question - QID 3342

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QID 3342 (Type "3342" in App Search)
An 8-day-old infant is admitted to the hospital for septic arthritis of the hip. He went home on day two after an uneventful vaginal birth. Which of the following will most likely be the causative organism by culture?

Group B Streptococcus

78%

2930/3756

Staph Aureus

17%

645/3756

Staph Epidermidis

0%

12/3756

Haemophilus Influenzae

2%

88/3756

Neisseria Gonnorhea

1%

55/3756

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Group B Streptococcus is the most common causative organism of neonatal septic arthritis. It should be noted in the subgroup of neonates who acquire nosocomial septic arthritis, Staph Aureus is more common than Group B Strep. These infections often arise from invasive procedures such as central lines and indwelling catheters. Children in the first 2 years of life have the highest frequency of septic arthritis. In children 3 months of age to 2 years, H. Influenzae was traditionally the most common organism, but its prevalence has fallen significantly since the introduction of H. Flu vaccinations. In children over 2 years of age, Staph Aureus is the most common causative organism.

In an Instructional Course Lecture, McCarthy et al summarize the pathogenesis, evaluation, treatment, and prognosis of musculoskeletal infections in children. They emphasize long-term follow up as a musculoskeletal infection in a growing child may have further impact as the child ages.

Dan et al reviews a case series of pediatric septic hips to correlate the most common bacterial isolates in young infants.

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