There is a study discussing the Indiana church outbreak. At the time, it was the largest outbreak in nearly a decade. You can find a lot of information about it by just googling "Indiana measles outbreak 2005" if you are interested.
measles cases are supposed to be reported as well. From Nebraska government website:
For suspected measles cases and before sending specimens to NPHL: call your local health
department. Isolate suspect measles case-patients and immediately report cases to local health departments to
ensure a prompt public health response.
This is true for virtually ever state I've seen. See California's guidelines for example:
Outbreak procedures have been developed by the Centers for Disease Control and the California Department of
Public Health. The County of Riverside Department of Public Health, Disease Control Branch has formulated this
manual to assist school staff during measles outbreaks.
Confirmed and suspect measles cases should be reported immediately to Disease Control by telephone at: (951)
358-5107, during regular business hours; (951) 782-2974, after hours and holidays, ask to speak with the second
call Duty Officer. Identify all Susceptible Pupils in the Schools
Your school should have a system in place for fast and easy identification of susceptible students without having to
check all records at the time of an outbreak or identification of a single case of confirmed or suspect case of measles.
The list of susceptible students must be provided to Disease Control within 48 hours.
From the Nebraska Department of Health and Human Services:
1-007.04 Responsibilities of Schools: School nurses or those acting in the capacity of a
school nurse must, in accordance with state and federal statutes:
1. Notify the local public health department or the DHHS Division of Public Health
of cases or suspected cases of reportable diseases as indicated in 173 NAC 1-
004.01 and 1-004.02, or outbreaks and suspected outbreaks of diseases as
indicated in 173 NAC 1-004.01B affecting students and/or other school-affiliated
personnel and which present a reasonable threat to the safety or health of a
student and/or other school-affiliated personnel; and
2. Cooperate with public health authorities in obtaining information needed to
facilitate the investigation of cases and suspected cases, or outbreaks and
suspected outbreaks of diseases affecting students and/or other school affiliated
Measles is listed in that document as one of the diseases that is supposed to be reported immediately.
So, it doesn't have to be a confirmed outbreak before public health measures meant to reduce the risk of spread can occur. Further, it doesn't matter how far apart the schools are from each other if the suspected measles case came into contact with the boy in discussion at a soccer tournament.
It is pretty standard from my experience that you must attend school that day to go to a practice/game at the school. I haven't heard a statement from the coach - it is possible the son made a scene about not being able to practice or attend the game which resulted in disciplinary action and loss of his starter position. Who knows?
Interesting that people seem to be focusing on the soccer team and not the federal lawsuit claiming religious discrimination. I have to agree with the school that this is not a case of religious discrimination. The school was advised by multiple health departments to keep any susceptible students possibly exposed at home and away from the rest of the school. The school administrators are not public health experts, thus it is reasonable that they follow the recommendation of the health department and may have even got themselves into legal trouble had they refused to do so. It just so happens their son was the only one unvaccinated on the team. That is not evidence of religious discrimination. I really don't see this lawsuit being successful. To me, it sounds like proper protocol was followed regarding a suspected
measles case and that the school's hands were essentially tied once the health department got involved.