RT Book, Section A1 Hay, Jr, William W. A1 Levin, Myron J. A1 Deterding, Robin R. A1 Abzug, Mark J. SR Print(0) ID 1145453819 T1 Arthritis, Pyogenic T2 Quick Medical Diagnosis & Treatment Pediatrics YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9781264257614 LK accesspediatrics.mhmedical.com/content.aspx?aid=1145453819 RD 2024/04/25 AB Source varies according to the child's ageInfantile pyogenic arthritis often develops from adjacent osteomyelitisIn older children, it presents as an isolated infection, usually without bony involvementIn teenagers, an underlying systemic disease or an organism that has an affinity for joints (eg, Neisseria gonorrhoeae) may be presentThe most frequent infecting organisms similarly vary with ageGroup B Streptococcus and Staphylococcus aureus in those younger than 4 monthsHaemophilus influenzaetype b (if unimmunized) and S aureus in those aged 4 months to 4 yearsS aureus and Streptococcus pyogenes in older children and adolescentsStreptococcus pneumoniae and Neisseria meningitis are occasionally implicated, and N gonorrhoeae is a cause in adolescentsKingella kingae is a gram-negative bacterium that is increasingly recognized as a cause of pyarthrosis (and, occasionally, osteomyelitis) in children younger than 5 years