(AP) – Merck is recalling about a million doses of a childhood vaccine.
The move was made after testing showed a sterilization problem at its Pennsylvania plant.
Merck is not aware of any harm to children who received the vaccine — known as Hib — which prevents meningitis and pneumonia.
The vaccine is a three-dose shot recommended for all children under 5 and is usually given to infants starting at two months old.
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