A 4-year-old boy presents with fever and a swollen knee. Aspiration shows gram-negative bacilli. Most likely diagnosis is:

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Question 1 of 5

A 4-year-old boy presents with fever and a swollen knee. Aspiration shows gram-negative bacilli. Most likely diagnosis is:

Correct Answer: A

Rationale: Septic arthritis fits fever and gram-negative bacilli, per AAP. B-E lack infection.

Question 2 of 5

A 2-year-old boy presents with fever and vesicles in the mouth. Most likely diagnosis is:

Correct Answer: B

Rationale: HFMD features oral vesicles, per CDC. A, C-E differ.

Question 3 of 5

A 5-year-old boy presents with hematuria and proteinuria. Labs show low C3. Most likely diagnosis is:

Correct Answer: B

Rationale: PSGN features hematuria and low C3, per AAP. A, C-E differ.

Question 4 of 5

A 2-year-old boy presents with a limp and knee pain. Labs show elevated ESR. Most likely diagnosis is:

Correct Answer: C

Rationale: JIA features limp and elevated ESR, per ACR. A, B, D, E differ.

Question 5 of 5

A 4-year-old boy presents with fever and a sandpaper rash. Throat culture grows group A Streptococcus. Most likely diagnosis is:

Correct Answer: B

Rationale: Scarlet fever features sandpaper rash and GAS, per IDSA. A, C-E differ.

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