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| | Nat' Academies Press, Adverse Events Associated with Childhood Vaccines: Evidence Bearing on Casuality (1994) |
 | | Biologic plausibility for a causal relation between mumps vaccine and orchitis stems from the relation between wild-type mumps virus and orchitis (Association for the Study of Infectious Disease, 1974; Bendersky-Malbec, 1982; British Medical Journal, 1980; Sandler, 1954; Werner, 1950a,b) and from the temporal correlation between mumps vaccine and orchitis in several individual cases. |
 | | Because orchitis is uncommon, it seems possible that cases temporally related to mumps vaccination are caused by the vaccine virus. |
 | | However, it is also possible that at least some of the cases of orchitis following administration of mumps vaccine were caused by infection with wild-type virus, because the impetus to immunize males often is exposure to mumps disease. |
| www.nap.edu /books/0309048958/html/163.html (550 words) |
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