The daycare my nephews go to almost sent one home today for bronchitis. The worker mentioned she would love to have a list of contagious illnesses plus how they are transmitted and for how long they are contagious.
Here is a page that has a pretty good list of illnesses. I keep it bookmarked. I don’t think it lists all possible childhood ilnesses - but it seems like a good number of them.
An excellent reference book on contagious diseases is produced by the American Public Health Association. It is the Control of Communicable Diseases Manual. You can find out about it on the APHA website at http://www.apha.org/media/science.htm