Children contracting communicable diseases such as measles, mumps, chicken pox, colds, flu etc should be kept at home to prevent the spreading of such diseases through the school.
A special check, by parents, should be kept on things such as school sores and head lice.
Time Out/Exclusion periods and fact sheets can be found on the Queensland Health website:
https://www.childrens.health.qld.gov.au/chq/information-for-families/fact-sheets/
https://www.health.qld.gov.au/__data/assets/pdf_file/0025/702619/timeout-brochure.pdf
https://www.health.qld.gov.au/__data/assets/pdf_file/0022/426820/timeout_poster.pdf