An asthamatic scientist's view
As a card-carrying, grade-A, life-long asthmatic scientist myself, I think I may be qualified to comment here.
As you are most likely aware, asthma comes in many forms and grades - from mild intermittent childhood wheezes to chronic permanent breathlessness. The causes of it are now well known, and due to well-conducted medical studies that continue to reveal facts, treatment has improved out of sight in the last decade. I myself have been involved as a guinea-pig on a number of asthma research programs here in Australia.
These new treatments range from simple breathing exercises to removing underlying asthma triggers to drugs. Many children with mild asthma will lose it as they grow. Workers in dusty environments, or smokers or people with chronic bronchitus, lose their asthma when they change environments, stop smoking, or get cured. Not every asthmatic is a wheezing wreck, not every cure is drug-related.
Regarding this study involving "healers", it does seem to be suffering from the same problems that some other "wonder cures" came up against. Put simply, they claimed cures for patients who were not actually sick, and were ignoring recidivism of symptoms. Best example was Buteyko - specific studies on it here in Australia gave it a very poor report card.
So I would be asking first if there is any pre-testing to determine the frequency and severity of asthma in the subjects. Are the subjects being allowed to include themselves as "asthmatics" without medical proof that they actually are? Is there some sort of entry-level of severity? Commonality of symptoms? Commonality of environments?
Second, what level of "cure" has been claimed, and has this been borne out by the results? What standards are being used to measure the subjects?
To be honest, it all looks very vague to me, and I wonder if it is not just a mechanism to measure the placebo effect of the healers in general practice rather than cure asthma.
cheers
Zep