Starting from December 2006, Enterococcus cecorum infections with a clinical course have increasinglybeen observed in Belgian broilers. The present paper describes the characteristics of the disease on the basisof observations in 10 different farms. The affected chicks always suffered from paresis and lameness. Onsetof the signs was usually within the first 2 weeks of life, and it resulted in up to 7% increased mortality startingfrom day 21-32. The cocks were affected significantly more often than the hens. Lesions of osteomyelitisof the caudal thoracic vertebrae compressing the spinal cord and/or arthritis of the hock joints were consistentlyfound. E. cecorum was always isolated from these lesions. The disease was recurrent in successive roundsin 9 out of the 10 farms. Antibiotic treatment was only successful when initiated preventively from the firstweek of life onwards. Other infections often associated with similar signs were not detected. It can be concludedthat E. cecorum infections form an important emerging disease in broilers, leading to high mortality rates.