“However, I heard that the reason this episode came to our attention was that the infected family led to a significant outbreak...much more than those of the two unfortunate kids who couldn’t be vaccinated.”
The two kids were part of those exposed, luckily, they did not get infected. The actual outbreak was not large:
“Arizona has diagnosed only seven cases of measles, but those infected people have exposed as many as 1,000 others, including babies too young to have had their first measles shot, according to the Arizona Department of Health Services.
The Arizona measles cases began with one unvaccinated family of four from Pinal County that went to Disneyland, according to state health officials. Back at home, one of the children went to two urgent-care centers for medical attention, exposing 18 children, 13 of whom were unvaccinated. That family also exposed a woman from Maricopa County, who then exposed as many as 195 children at a child care center. A man who caught measles from the family then exposed others.”
So they infected seven people, five from their hometown, and I believe two from Maricopa county. Thousands were exposed, but thankfully, the immunity from vaccinations seems to have prevented a wider outbreak.
An interesting thing to know would be what percentage of the exposed were vaccinated.
Since I remember hearing that measles was highly infectious, I’d venture to guess that almost all of those who caught it had not been vaccinated. But, if they were, that would be interesting to know, because it speaks to the efficacy of the vaccine.