As summer begins, signaling peak time for insect stings, allergists across the U.S. are warning of a shortage of a little-known but crucial product — honeybee, hornet and wasp venom extracts used in shots that prevent life-threatening reactions.Supplies of the extracts — which are made from venom gathered by hand from millions of individual insects — have been scarce since October. That's when one of two manufacturers in the U.S. shut down production after contamination problems. Doctors [...]
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