Fifth disease (named because there used to be 5 rash-associated childhood infections) is a virus, parvovirus B19, that often goes storming round schools in spring time. It shows as a very distinctive red rash on the face that looks as if a child has “slapped cheeks”. Most children recover from it quickly. It usually begins with a low-grade fever, headache and mild cold-like symptoms; then a few days later the bright red cheeks appear before fading in 1 to 3 weeks.

A child is not contagious once the rash appears. It is usually such a mild illness that no medicine is necessary – but sometimes paracetamol / ibuprofen are prescribed if there is a temperature. If you are pregnant and think you have been infected then you should see your GP although most adults are immune.