Trotz Masernimpfungen können Erkrankungen auftreten und es kann auch durch eine geimpfte Personen eine Übertragung von Masern erfolgen

http://www.aerzteblatt.de/nachrichten/58347/Measles-Mary-Geimpfte-Person-uebertraegt-Masern

http://www.ncbi.nlm.nih.gov/pubmed/25155071
„This is the first report of measles transmission from a twice-vaccinated individual with documented secondary vaccine failure“

http://cid.oxfordjournals.org/content/early/2014/02/27/cid.ciu105.abstract

„a significant proportion of non-responder vaccinees was observed.“

http://www.ncbi.nlm.nih.gov/pubmed/25115114
„Failure of 31.4% of these infants to sero-convert post vaccination can be attributed partly to administration of sub-potent vaccines.

http://www.ncbi.nlm.nih.gov/pubmed/24825255
„Vaccine effectiveness was 76.6%“

http://www.ncbi.nlm.nih.gov/pubmed/24585562

„According to the cohort study, vaccine efficacy for one dose was 34% and was 67% for two doses.Vaccine effectiveness was lower than expected.“

http://www.ncbi.nlm.nih.gov/pubmed/25475656

http://www.praxiskuepper.de/wann-impfen—wann-nicht/expertenfortbildung-zum-thema/index.php