I would go to your health unit and get the "official" version of symptoms, incubation, exclusion, etc) and print it off for parents. Let them know that they have the option to bring their child or not. BUT caution them that because they have been exposed they should NOT go to another daycare and risk spreading the disease since they could already be contagious. If parent can't stay home they need to make similar arrangements ie relative not daycare - most will either stay home or bring child anyways and cross their fingers.

Just remember that when their child comes down with it that you will be obligated to keep them in care since there is no exclusion policy as in you can't have a double standard. Since it is your own child that is sick I wouldn't close as such but I would give parents the option to stay home. I likely wouldn't charge them for the days if they did stay home but your warning above about no health unit exclusion rules, and already exposed so no other daycare might just have them come as normal.

Good week to "spring clean" and get the kids scrubbing. We have been doing bigger toys this week with me washing and them drying.