P.S.>  back from vacation in Canada.....
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Research has discovered that vitamin D may be an effective therapeutic agent to treat or prevent allergy to a common mold.

Aspergillus fumigatus, is one of the most prevalent fungal organisms inhaled by people.  In asthmatics and in patients with Cystic Fibrosis, it can cause significant allergic symptoms.

According to Physorg:

“The researchers focused on Th2 cells -- the hormonal messengers of T-helper cells that produce an allergic response ... The researchers discovered that heightened Th2 reactivity ... correlated with a lower average blood level of vitamin D.”