Author Contributions: Dr Wasley had full access
to all of the data in the study and takes responsibility for the integrity
of the data and the accuracy of the data analysis.
Study concept and design: Wasley, Samandari,
Acquisition of data: Wasley, Samandari.
Analysis and interpretation of data: Wasley,
Drafting of the manuscript: Wasley, Samandari,
Critical revision of the manuscript for important
intellectual content: Wasley, Samandari, Bell.
Statistical analysis: Wasley, Samandari, Bell.
Study supervision: Bell.
Financial Disclosures: None reported.
Acknowledgment: We thank David Culver, PhD,
for providing advice on statistical methodology and Steven Bloom for his assistance
in data analysis. Our thanks also to the staff of state and local health departments
and health care providers in the community, which by reporting cases of hepatitis
A make surveillance for this disease possible.
Funding/Support: Support for the analyses presented
here was provided by the Centers for Disease Control and Prevention.