SMALLPOX CONTROL IN CANADA.

Area of Science:

• Epidemiology
• Public Health
• Infectious Disease Control

Background:

• International air travel increased the risk of smallpox importation between 1961-1963, leading to outbreaks in multiple countries.
• Notable outbreaks resulted in significant cases and deaths among healthcare professionals, highlighting their vulnerability.
• Canada experienced a smallpox importation in 1962, underscoring the ongoing risk despite widespread vaccination.

Purpose of the Study:

• To emphasize the risk of importing incubating smallpox cases into Canada due to international air traffic.
• To highlight the importance of maintaining smallpox immunity in healthcare personnel.
• To inform physicians about reporting adverse reactions to immunizing agents.

Main Methods:

• Review of historical smallpox importation events and associated outbreaks.
• Analysis of risks associated with international air travel and disease transmission.
• Communication strategy involving the Food and Drug Directorate and physicians for adverse event reporting.

Main Results:

• Ten smallpox importations via aircraft occurred between 1961-1963 across Europe and Canada.
• Outbreaks disproportionately affected physicians and health personnel, indicating a need for enhanced protection.
• Complications from smallpox vaccination can be minimized by adhering to contraindications.

Conclusions:

• Maintaining robust smallpox immunity among Canadian healthcare workers is essential for preventing future outbreaks.
• Physicians play a critical role in monitoring and reporting adverse reactions to vaccines.
• Vigilance and continued public health measures are necessary to mitigate the risk of imported infectious diseases.