1. Centers for Disease Control and Prevention, Influenza. http://www.cdc.gov/flu/.
2. Centers for Disease Control and Prevention, Influenza Risk Assessment Tool (IRAT). http://www.cdc.gov/flu/pandemic-resources/tools/risk-assessment.htm.
3. Centers for Disease Control and Prevention, CDC Intervals for a Novel Influenza A Virus Pandemic: State/Local and Federal Indicators, Decisions, and Actions. http://www.cdc.gov/mmwr/preview/mmwrhtml/rr6306a2.htm.
4. Centers for Disease Control and Prevention, Updated Preparedness and Response Framework for Influenza Pandemics. http://www.cdc.gov/mmwr/preview/mmwrhtml/rr6306a1.htm.
5. Centers for Disease Control and Prevention, Recommendations of the Advisory Committee on Immunization Practices (ACIP). http://www.cdc.gov/vaccines/hcp/acip-recs/.