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Palivizumab must be administered monthly by intramuscular injection throughout the RSV season to maintain the serum concentration at a level sufficient to provide protection against respiratory syncytial virus (RSV). The objective of this study is to determine factors associated with completing all doses of palivizumab. The method was a survey mailed to the families of 385 high-risk children who were eligible to receive palivizumab at Columbus Children's Hospital in 1998-1999. Seventy-eight percent of eligible children received all doses of palivizumab. The strongest predictor of compliance was parents' perception that palivizumab would protect their child from RSV; 67% of parents in the compliant group reported they believed palivizumab protected their child``a great deal''against RSV compared with 48% in the noncompliant group (p= 0.04). Difficulty with transportation was also a barrier to compliance; 85% of …