However, on April 23 a new concern emerged when a reputable pharmacy in Ocala, Florida disclosed that in compounding a preparation for the polo ponies which may have been intended to substitute for Biodyl, the pharmacy accidentally used an incorrect quantity of one of the ingredients.
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In April 2009, the sudden deaths of 21 polo ponies at Palm Beach International Polo Club in Florida were attributed by a polo team captain to error or tampering in the team's supply of Biodyl.