The vaccinated often aren't protected by the vaccines they've been told are going to protect them. Measles vaccine protection is NOT lifelong. It has a very high rate of failure. It doesn't seem to work at all, despite government officials encouraging more vaccinations with more of the same crap that didn't work in the first place;

“An outbreak of measles occurred in a high school with a documented vaccination level of 98 per cent.”
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1646939/

“Vaccination coverage for the population was 99%. Incomplete vaccination coverage is not a valid explanation for the Quebec City measles outbreak. ”
https://www.ncbi.nlm.nih.gov/pubmed/1884314

“The epidemiology of measles in Cape Town has thus changed as evinced in this epidemic, with an increase in the number of cases occurring in older, previously vaccinated children.”
http://www.biomedsearch.com/nih/1992-measles-epidemic-in-Cape/7740350.html

This is probably why....

Former Merck virologists confess: Stephen Krahling and Joan Wlochowski, both say the Merck company engaged in all the following:

Merck knowingly falsified its mumps vaccine test results to fabricate a “95% efficacy rate.” In order to do this, Merck spiked the blood test with animal antibodies in order to artificially inflate the appearance of immune system antibodies.

Merck then used the falsified trial results to swindle the U.S. government out of “hundreds of millions of dollars for a vaccine that does not provide adequate immunization.”

Merck’s vaccine fraud has actually contributed to the continuation of mumps across America, causing more children to become infected with mumps.

Merck used its false claims of “95 percent effectiveness” to monopolize the vaccine market and eliminate possible competitors.

The Merck vaccine fraud has been going on since the late 1990’s, say the Merck virologists.

Testing of Merck’s vaccine was never done against “real-world” mumps viruses in the wild. Instead, test results were simply falsified to achieve the desired outcome.

"At all times relevant to this action, Merck has breached its express warranties with

regards to the Mumps Vaccine because the Mumps Vaccine does not have the 95%

efficacy rate represented by Merck, in violation of state express warranty laws including:

(all fifty US states are listed here on docket)."

(Fifth Cause of Action - Unjust Enrichment; p. 58)

(i) falsifying data in order to represent, and then falsely
representing that its Mumps Vaccine is 95% effective in package inserts, government
applications, during recent outbreaks and through the IAC; and (ii) actively concealing
the true, substantially lower efficacy of its Mumps Vaccine by destroying evidence of
falsified data, lying to an FDA representative, attempting to buy the silence and
cooperation of its staff by offering financial incentives, and threatening one thenemployee,
Relator Stephen Krahling, with jail if he reported the fraud to the FDA."

"Over the past decade, Merck's fraudulent scheme to misrepresent the efficacy of its

mumps vaccine has cost the U.S. hundreds of millions of dollars through the

government's annual purchases of the vaccine under the National Vaccine Program

("NVP")."
https://www.naturalnews.com/gallery/documents/Merck-False-Claims-Act.pdf
http://www.huffingtonpost.ca/lawrence-solomon/merck-whistleblowers_b_5881914.html
http://www.rescuepost.com/files/june-mumps-suit.pdf
http://www.dailymail.co.uk/health/article-17509/Why-Japan-banned-MMR-vaccine.html