U.S. adults with knowledge of infectious diseases as of 2017, by age
This statistic displays the percentage of U.S. adults that had heard of various infectious diseases as of 2017, by age. According to the survey, 79 percent of respondents aged 18 to 34 years had heard of bronchitis, compared to 92 percent of respondents aged 65 and older. Bronchitis is a lung condition in which the airways of the lungs swell and produce mucus and is caused by viral or bacterial pathogens.