Several challenges can complicate data access in epidemiology: - Legal and Regulatory Barriers: Different jurisdictions have varying laws and regulations governing data access and use. - Data Sensitivity: Sensitive data, such as genetic information, may have additional restrictions to protect individual privacy. - Resource Limitations: Limited funding and resources can hinder the ability to store, manage, and share large datasets. - Interoperability: Differences in data formats and standards can make it difficult to integrate and analyze data from multiple sources.