Nearly three-quarters of a million doses of Merck & Co.’s Gardasil vaccine for HPV and cervical cancer have been recalled following the discovery that they may be contaminated. The U.S. Centers for Disease Control and Prevention (CDC), which actively promotes the vaccine for 11- and 12-year-old boys and girls, says that the affected vaccines may contain glass shards due to a manufacturing error that resulted in the breakage of vials. A total of 743,360 Gardasil vials from Lot J007354 are included in the recall, which Merck says were distributed between August 20, 2013 and October 9, 2013. Among these vials, as many as ten vials of the vaccine may contain the shards, although most have probably already been administered to children. Merck says that the glass particles are so small that they can actually be transferred through the vaccine needle directly into the muscle tissue. More