What type of vaccine is being recalled, and why?
There is a recall in the United States for several lots of Haemophilus influenzae type b vaccine, often called “Hib vaccine”, made by Merck & Co. Inc. The doses were distributed throughout the U.S. starting in April, 2007. Two types of Merck’s vaccine are being recalled; one is a Hib vaccine alone and the other is a combination vaccine that includes Hib and hepatitis B vaccine. No problems have been found with the vaccine itself. The strength and effectiveness of the vaccines are fine. Each of the lots of vaccine that has been recalled passed all routine safety tests before being sent to doctor’s offices and those tests found no contamination. However, the lots of vaccine are being recalled as a precautionary step because Merck cannot guarantee they are completely sterile because there is a remote possibility that a type of bacteria (called “B. cereus”) was on equipment at the time the vaccine was manufactured. This recall means that doctors’ offices and other clinics need to check the
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