Huge asthma increase in Japan over 30 years From Asthma cases increase sixfold in 30 years in Japan
Only 1 percent of children suffered from bronchial asthma in the 1960s, but that figure rose sharply to between 3.9 percent and 8.2 percent in the 1990s. The percentage also widely varies among regions.
In addition, children are becoming asthmatic at younger ages, as 80 percent of sufferers develop symptoms by the age of 3.
What has changed?
Medical experts point out that modern draft-free houses, the proliferation of heaters and other developments in housing have helped dust mites--seen as one of the main causes of the disease--grow in number.
However, the exact causes vary widely, and studies of countermeasures against the disease remain insufficient.
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