PURPOSE: To describe the incidence and characteristics of illnesses affecting Team USA athletes during the Tokyo 2020 Summer Olympic Games. METHODS: All Olympic athlete medical encounters occurring during the Tokyo 2020 Summer Olympic Games (July 12 - August 11, 2021) were reviewed to identify new illnesses. Illnesses meeting the definition as described by the International Olympic Committee reporting guidelines were included in the analysis. New illnesses were categorized using the Orchard Sports Injury and Illness Classification System. Details of the athletes (sex) and illness (type) were examined and incidence rates (IR) with 95% confidence intervals per 1,000 athlete days (AD) were calculated. RESULTS: Six hundred and twenty-six US athletes (male, n = 341; females, n = 285) competed in the Tokyo 2020 Summer Olympic Games, accounting for 11,204 AD. A total of 51 illnesses (male, n = 18; females, n = 33) were documented resulting in an IR of 4.6 [95% CI; 3.3, 5.8] per 1,000 AD. The most common illnesses diagnosed were infections (23.5%; IR, 1.1 [0.5, 1.7] per 1,000 AD), followed by gastrointestinal (15.7%; IR, 0.7 [0.2, 1.2] per 1,000 AD), dermatologic (13.7%; IR, 0.6 [0.2, 1.1] per 1,000 AD), respiratory (11.8%; IR, 0.5 [0.1, 1.0] per 1,000 AD), ears/nose/throat (11.8%; IR, 0.5 [0.1, 1.0] per 1,000 AD), eye (5.9%; IR, 0.3 [0.0, 0.6] per 1,000 AD), and environmental illnesses (5.9%; IR, 0.3 [0.0, 0.6] per 1,000 AD). Other illnesses included psychological (3.9%; IR, 0.2 [-0.1, 0.4] per 1,000 AD), genitourinary (2.0%; IR, 0.1 [-0.1, 0.3] per 1,000 AD), and cardiovascular (2.0%; IR, 0.1 [-0.1, 0.3] per 1,000 AD). CONCLUSION: Among US Olympic athletes competing in the Tokyo 2020 Summer Olympic Games, infections, gastrointestinal illness, and dermatologic conditions represented over 50% of all documented illnesses. Surveillance and characterization of illness among Olympic athletes is crucial to understanding illness risk factors during the Games period and implementing prevention strategies to keep athletes healthy and at peak performance during future Olympic Games.
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