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Thermal image scanners to detect fever in airline passengers, Vancouver and Toronto, 2003.

During the Severe Acute Respiratory Syndrome (SARS) outbreak of 2003, rapid population migration facilitated the spread of the disease from one country to another. In an attempt to prevent importation and exportation of the virus, the World Health Organization (WHO) made recommendations for screening of international passengers . These recommendations included screening of passengers departing from affected areas by means of a questionnaire or interview and, in the event of an ill passenger on a flight from an affected area, isolation of that person and identification of their contacts.