The Jeryl Lynn Vaccine Strain of Mumps Virus is a Mixture of Two Distinct Isolates Afzal, M. A. and Pickford, A. R. and Forsey, T. and Heath, A. B. and Minor, P. D.,, 74, 917-920 (1993), doi = https://doi.org/10.1099/0022-1317-74-5-917, publicationName = Microbiology Society, issn = 0022-1317, abstract= Sequence analysis of the region of the mumps virus genome encoding the putative small hydrophobic protein gene confirms that it is a highly variable region. Jeryl Lynn, the mumps vaccine strain used in the U.K., is shown to be a mixture of two closely related viruses, both probably of American origin., language=, type=