Québec researchers found no association between the BCG vaccine, which is used to prevent tuburculosis (TB), and childhood asthma.

The investigation, based on a large sample drawn from the Québec population, was published in the American Journal of Epidemiology. The team had already compiled data from the registries and archives of the BCG vaccination campaign in Québec from 1956 to 1974, which led to a study previously published in the journal Vaccine.

Combining some of these data with several reliable public health data sources on asthma and using a survey designed to collect information on relevant risk factors, they were able to investigate the presence of any links between BCG vaccination and asthma with a high degree of accuracy.

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