In Register > Notes you can see all notes entered on a specific date:
If you require a specific date range you can go to Reporting > Custom Report:
Select New Report, put the date range you require on the left side of the screen, and under Attendance on the right side choose Attendance Notes:
Any Attendance Note recorded in this period will appear in the Attendance Notes column, although the exact date of the note is not recorded (you will need to go to the student profile, Attendance Tab, to check this). In this area you can filter for a particular Note type, e.g. Chicken Pox (enter the search term in the search box beneath the title cell) to get totals for a particular note category.