Synergism between allergens and viruses and risk of hospital admission with asthma: case-control study

The wrong table 3 was published in the print version of this paper by Rosalind Green and colleagues (30 March, pp 763-6). The correct table shows the univariate analysis of potential risk factors for admission to hospital in two groups of patients with asthma. It can be accessed in the full version of the paper as table 5 on bmj.com/cgi/content/full/324/7340/763. We apologise for this error.