In pediatric patients, what is the most common causative organism for acute hematogenous osteomyelitis across all age groups?

Explanation:
Staphylococcus aureus is the most common causative organism for acute hematogenous osteomyelitis in children of all age groups. While Kingella kingae is increasingly recognized in children under 4 years old (especially in osteoarticular infections), and Group B Strep is seen in neonates, S. aureus remains the overall most prevalent pathogen. Reference: Miller's Review of Orthopaedics, 8th Edition.