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TRENTON, N.J. (AP) - Young children needing immunization against chickenpox and three other diseases likely will have to get an extra shot, due to manufacturing problems that have halted production of a four-disease combo vaccine made by Merck & Co.
Merck said Thursday that its ProQuad vaccine, which protects against measles, mumps and rubella as well as chickenpox, won't be available from about July until at least year's end.
"It's too early to say at this point whether new (ProQuad) supplies will be available in 2008," said Mary Elizabeth Blake, spokeswoman for Merck's vaccines division.
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