The article does not state whether the other children were vaccinated, and to assume that they were is your deal, as it suits the agenda of those who are anti-vaccination, but it remains a assumption, not a fact, until proven differently.
It is reasonable to think that the people reporting the incident, simply do not know whether the remaining children were vaccinated or not, and this is why they did not state that they were.
I am not pro or anti vaccination, but I do prefer to see honesty rather than spin, and lies. The OP has tried to put his/her own spin on articles before, on this forum, mis-representing and changing the original words to suit his/here own agenda, and has been caught out doing it again. This does the anti-vaccination no good at all. If data, articles, and studies have to be twisted, changed and lied about, the cause is in deep trouble.