RT Journal Article SR Electronic T1 Seasonal pattern of acute bronchitis in general practice in the United Kingdom 1976-83. JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 106 OP 110 DO 10.1136/thx.41.2.106 VO 41 IS 2 A1 J G Ayres YR 1986 UL http://thorax.bmj.com/content/41/2/106.abstract AB Weekly returns from the Royal College of General Practitioners research unit for acute respiratory illnesses in general practice in the United Kingdom show appreciable variation in attack rates for acute bronchitis, from a peak in January to a trough in August. In 1983, for example, it varied from 171.4 per 100 000 to 34.5 per 100 000. This pattern is identical for all years from 1976 to 1983. Attack rates are highest in the extremes of life and lowest in the 15-44 age group. As many cases of asthma are misdiagnosed as acute bronchitis, further analysis of these data will be difficult until the exact diagnostic criteria for acute bronchitis used by these general practitioners are established.