With the first day of school around the corner, parents will once again be faced with decisions concerning their children and their education, such as when it's OK to keep them at home when they're sick.
Dr Claire McCarthy from the Harvard Medical School says if your child's temperature is 38 degrees or above, they have a fever and should not go to school.
Not only are fevers a sign of some sort of infection, it also usually means that they are shedding germs right and left.
"Not only are fevers a sign of some sort of infection, it also usually means that they are shedding germs right and left. There's just no way you can know whether things will get better or worse - and while giving them medicine might bring the fever down, it won't stop them from being contagious."
The University of Michigan Health System says if your child has diarrhoea or is vomiting (common childhood ailments) it could mean a range of things from them having a virus to food poisoning. "If symptoms will disrupt the school day, are accompanied by pain or fever or if the child is too young to manage symptoms (making trips to the bathroom or being conscious of handwashing) then you should keep your child at home."
Other signs not to ignore when your child is ill include changes in behaviour or breathing patterns, stomach ache or headache accompanied by vomiting or diarrhoea and stubborn symptoms.
Concerning illnesses that are contagious, parents should get the go-ahead from a medical practitioner on when it is safe for children to go back to school.