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What you call "poisoned heparin" is tainted heparin that leaked into different countries, believed to be coming from China.
The F.D.A. sent a warning letter to Changzhou SPL, the Chinese plant identified as the source of contaminated heparin made by Baxter International in the United States. It warned that the plant used unclean tanks to make heparin, that it accepted raw materials from an unacceptable vendor and that it had no adequate way to remove impurities.
Heparin is made from the mucous membranes of the intestines of slaughtered pigs that, in China, are often cooked in unregulated family workshops. The contaminant, identified as oversulfated chondroitin sulfate, a cheaper substance, slipped through the usual testing and was recognized only after more sophisticated tests were used.
Baxter's brand was linked to hundreds of reports of allergic-style reactions, including vomiting, nausea and difficulty breathing.
One good way of preventing ingestion of tainted heparin is by purchasing or availing it only from reputable establishments.
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