cocksackie with no sores, anyone?

A child in my son's daycare had cocksackie.  They won't give us any details about when he/she had it, how long they were out, etc. ( I don't really care who had it, just about whether the child was actually kept long home enough to not be contagious anymore. ) During the week after this was announced, my son seemed to be complaining of stomachache on and off (clutching stomach and saying "oh, oh,"), and then slamming head on things while crying (possibly headache?  he's 1.5 so hard to tell...).  Then, 24 hour fever and woke next am happy--no sores at all.  Now, for last two days, my daughter is complaining of stomachache and headache on and off (they go to the same school, and obviously are exposed to each other at home, too).  I've read that some kids never develop sores, and stomachache, nausea and headache are common indicators, but the school is only excluding kids with fever and/or sores.  This makes me so aggravated--anyone else's kids have the same symptoms without the sores?  And if they're in school, how long did you keep them out?  (Though I'm missing work, I keep my kids home when they don't feel well....apparently I'm in the minority.  Argh!)