Describe the role of the International Health Regulations (IHR) in disease reporting within national surveillance systems.

• A. IHR provides global obligations for countries to detect, assess, report, and respond to public health risks that may cross borders; supports international collaboration.
• B. IHR requires vaccination for travelers.
• C. IHR applies only to domestic events with no cross-border risk.
• D. IHR restricts information sharing in outbreaks.

Answer: (A)

Global obligations under the International Health Regulations require countries to detect, assess, report, and respond to public health risks that may cross borders, and they foster international collaboration. In national surveillance, this means building the capacity to monitor for unusual health events, verify their significance, and determine if they could have international implications. When an event may threaten international health, the country must report it to the WHO promptly—ideally within 24 hours of assessment—providing essential information to enable rapid risk assessment and coordinated action. The aim is timely, transparent sharing that supports a global response to prevent or limit cross-border spread.

The other options don’t fit this role: vaccination requirements for travelers aren’t a function of the IHR; the regulations cover events with cross-border risk, not just domestic ones; and they promote information sharing rather than restricting it.