if you sign a CO, there is no contact from centrelink in regard to child care benefit as all the information comes from the childhood immunisation register (who deem you to be "current" with your immunisation decisions). it won't stop the child care provider from stopping your child from attending if there is an outbreak. and there are only limited absences from child care that you will be paid CCB for - i am honestly not sure if you will get CCB for the holding of your place if your child is prevented from attending due to an outbreak