Analysis of the month of birth of 4520 children with asthma in Manchester, born between 1964 and 1979, showed a statistically significant excess of asthmatic births in certain months. The explanation for these excesses is obscure. The peak months varied from year to year. Asthma may not be a good model to test the theory of infantile sensitization to allergens, because of the numerous possible causative allergens. Mothers wishing to avoid having asthmatic children cannot do so by choosing a particular season of birth.
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