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| WHO class | Name | Explanation |
|---|---|---|
| I | Untreated severe asthma | Uncontrolled. as yet untreated asthma |
| II | Difficult-to-treat asthma | Uncontrolled asthma due to adherence problems. persistent triggers. or comorbidities |
| III | Therapy-resistant asthma | Uncontrolled asthma despite maximum therapy or asthma control that can only be maintained with maximum therapy |
WHO. World Health Organization
