With the improvement of culture and molecular techniques, infections by the fastidious gram-negative coccobacillus Kingella kingae are increasingly diagnosed. The pathogen is now recognized as a major cause of osteoarticular infections in children. K.kingae clusters in day-care facilities have been previously reported, but in limited numbers, and outbreak control measures to apply remain unclear. Here we describe a cluster of 3 acute osteo-articular infections in a Wallonia-based day-care center occurring within a 15 days interval in 2018.