Relative fibroblast proliferation induced by bronchoalveolar lavage fluid obtained from infants who progressed to chronic lung disease of prematurity (CLD), who developed and recovered from neonatal respiratory disease (RDS), and control infants receiving mechanical ventilation for non-respiratory reasons. Relative fibroblast proliferation induced by bronchoalveolar lavage fluid obtained from infants who progressed to chronic lung disease of prematurity (CLD), who developed and recovered from neonatal respiratory disease (RDS), and control infants receiving mechanical ventilation for non-respiratory reasons. The proliferative activity is relative to the A650 value obtained for 10% fetal calf serum for each 96 well plate. *p < 0.01 for CLD v control and p < 0.05 for RDS v control. . A E Currie et al. Arch Dis Child Fetal Neonatal Ed 2002;86:F193-F197 Copyright © BMJ Publishing Group Ltd & Royal College of Paediatrics and Child Health. All rights reserved.