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- Charred bits of plastic shrink wrap found in some vials of Merck vaccines
- Merck said it is still working to resolve the problem
- Company said it isn't aware of any adverse health events from the issue
(Adds vaccine sales details in sixth paragraph.)
Charred bits of plastic shrink wrap have been found in vials of Merck & Co. (MRK) vaccines, the latest quality problem identified by U.S. regulators at the company's biggest vaccine-making plant and an issue the drug maker said it is still working to resolve.
Merck said it isn't aware of any adverse health events associated with the problem, and that it is confident in the safety and efficacy of its products. The affected vaccines included Gardasil for the prevention of HPV infection, Varivax for chicken pox, Pneumovax for pneumococcal disease, Zostavax for shingles and MMR II for measles, mumps and rubella.
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