Furthermore, the NCITs’ accuracy is based on an assumption that the NCIT readings from a forehead will predict the body core temperatures using a simple common one-size-fits-all correction offset. These thermometers require specific use protocols (e.g., working distances) to provide accurate results, which may not be followed by inspectors reluctant to approach potentially contagious travelers. Typically, screening is performed using commercially available non-contact infrared thermometers (NCITs). Screening involves monitoring the body temperature of entering travelers, and blocking entry of those showing a fever, indicating a potential infection. In recent years, outbreaks of highly contagious diseases, like the Ebola virus, have motivated vigorous efforts to screen travelers entering the United States, especially at airports.
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