Re: Index cases...

- Definite unvaccinated index case:
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5708a3.htm

Outbreak of Measles --- San Diego, California, January--February 2008

"The index patient was an unvaccinated boy aged 7 years who had visited Switzerland with his family..."

- Likely unvaccinated index case:
http://www.aviationpros.com/news/11403423/health-officials-in-pima-wary-after...

Health Officials In Pima Wary After Passengers With Measles Passes Through Phoenix Airport

"The individual, who had returned from Europe, may have exposed others at several public locations in Phoenix, including Sky Harbor International Airport, officials say... Pima County measles outbreak was believed to have been caused by an unvaccinated Swiss tourist"  (A measles epidemic ensued in the area)

Unvaccinated more likely to become infected and require hospitalization:
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6020a7.htm#Fig1

Measles --- United States, January--May 20, 2011

"...118 cases were reported from 23 states""Of the 118 cases, 48 (40%) resulted in hospitalization"
"All but one hospitalized patient were unvaccinated"
"Unvaccinated persons accounted for 105 (89%) of the 118 cases. Among the 45 U.S. residents aged 12 months−19 years who acquired measles, 39 (87%) were unvaccinated, including 24 whose parents claimed a religious or personal exemption and eight who missed opportunities for vaccination. Among the 42 U.S. residents aged ≥20 years who acquired measles, 35 (83%) were unvaccinated, including six who declined vaccination because of philosophical objections to vaccination. Of the 33 U.S. residents who were vaccine-eligible and had traveled abroad, 30 were unvaccinated and one had received only 1 of the 2 recommended doses.

"Measles can be severe and is highly infectious; following exposure, up to 90% of susceptible persons develop measles. Measles can lead to life-threatening complications. "

And you still maintain that the unvaccinated cannot be "kindling" for a wider epidemic to both other unvaccinated, those with an incomplete measles vaccination regimen and those unable to receive vaccination due to medical conditions?  If the measles virus is circulating anywhere, the unvaccinated will be the most likely to be infected.