Data on the prevalence and significance of NTM infections in younger patients with CF are less clear. Several studies suggest that NTM infection in CF pediatric population is low 3-7 but the numbers vary around the globe. A study from Necker Hospital for Sick Children in Paris8 revealed a prevalence of 5 % in children with a mean age of age 11.9 y o (2.5 to 22 y o). It also revealed that M. abscessus was the prevailing organism among the pediatric population, rather than MAC, the commonest organism in adults.