Zdroj? Zatím vše nasvědčuje tomu, že celková imunita i cross imunita pro různé genotypy viru příušnic je mnohem lepší po prodělané infekci. Miniepidemie přiušnic u nás i v zahraničí se týkají prakticky jen očkované populace. Neočkovaná populace (která prodělala příušnice přirozeně dříve), se nenakazí.
https://books.google.cz/books?id=73pYBAAAQBAJ&pg=PA1943&lpg=PA1943#v=onepage&q&f=false
In the 2006 outbreak in the United States, 6584 cases of mumps were detected... The outbreak virus was of genotype G, the same virus genotype that had caused an outbreak in the United Kingdom during 2004 to 2006. Surprisingly, for those patients with known vaccine status, only 13% had not received vaccine and 63% had received two or more doses of mumps containing vaccine.
Další zajímavé čtení:
http://jvi.asm.org/content/86/1/615.full
Thus, although we have found clear evidence of antigenic differences among mumps virus strains, the fact that all sera neutralized all viruses supports the notion that mumps virus is serologically monotypic and argues against the evolution of exotic strains capable of escaping JL vaccine-induced immunity.