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Originally posted by bsl4doc
No, Merck isn't the only manufacturer. Chiron also produces vaccines, including MMR, for much of Europe. Asia, and the US.
The majority of cases are occurring among persons 18-25 years of age, many of whom are vaccinated.
The source of the current US outbreak is unknown. However the mumps strain has been identified as genotype G, the same genotype circulating in the United Kingdom (UK). The outbreak in the UK has been ongoing from 2004 to 2006 and has involved > 70,000 cases. Most UK cases have occurred among unvaccinated young adults (3). The G genotype is not an unusual or rare genotype and, like the rest of known genotypes of mumps, it has been circulating globally for decades or longer.