Did you mention Atypical measles only in the vaccinated?
Atypical measles occurs only in the vaccinated and can be fatal.
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Measles.aspx

Atypical measles was initially thought to occur only in those who received the killed measles vaccine, but several investigators have reported this illness in children who had been vaccinated only with the live measles vaccine.
Nichols EM. Atypical measles: a continuing problem. Am J Public Health. 1979;69(2):160-162.

Atypical measles
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1619057/

Atypical measles has been known about for almost as long as the measles vaccine has been around and it is ONLY found in the vaccinated. It is typified by a milder than usual rash which is probably where the ugly rumour has originated that vaccinated people get milder cases of measles than the unvaccinated. Though the rash may be less, the symptoms can be much worse and the chances of lung involvement are higher than with wild measles (20% +) and liver involvement 3% +) The earliest medical journal study I have about this is "Altered Reactivity to Measles Virus" Atypical Measles in Children Previously Immunized with Inactivated Measles Virus Vaccines. Fulginiti, V.A. et al; JAMA 18/12/67, Vol. 202, No. 12. Viera Scheibner has said that the chances of dying from wild measles are 0.03% while the chances of dying from atypical measles are between 12-15%. It was thought at one time that it was only the early inactivated vaccine that could cause atypical measles, but it is no known that any measles vaccine can. It seems that the vaccine perverts the immune process which may explain the reason why those who are vaccinated can get measles over and over without developing any natural immunity and may not be able to pass immunity onto their unborn child through the placenta.

Not sure why so many people are scared of a fever and a rash .

Can contracting the measles be deadly? Yes – if you are malnourished and live in an underdeveloped country with poor access to nutritious food, clean water, and medical care. How children have died from the measles in the US in over ten years? 2 ?
How many injuries and deaths from the vaccine ? Bioaccumulation of unwanted crap ? Seizures ? Ischemic Stroke ? Contamination (mycoplasma)
Some kind of life long disability , dysfunction or disease !

I will take my chance with a fever and a rash with life long immunity
NO BOOSTER Needed

Herd immunity ? You mean a measles party ?