Is it true that rubbing onions on a child’s injection site after immunisation can stop fever or other side effects? Many people in Uganda believe this helps prevent pain and high temperature. Anita
Dear Anita,
Onions have traditionally been used in folk medicine for various ailments. They are often applied to common colds by cutting them and placing them under the feet overnight, covered with socks. In some cases, they have been used in febrile convulsions in children by inserting them into the nose until the child sneezes. Adults may eat onions to alleviate joint pain (such as arthritis) and support heart health.
Onions are believed to possess anti-inflammatory, antibacterial, and antioxidant properties, largely due to a flavonoid called quercetin. However, applying onions to the site of a vaccination is unlikely to prevent symptoms such as fever or body aches. These symptoms typically indicate that the immune system is responding as expected after immunisation.
While immunisation protects us from many infectious diseases, mild side effects can occur and usually last a day or two.
In the past, immunisation centres sometimes administered low-dose aspirin to children to reduce these side effects, but this practice has been discontinued due to the risk of Reye’s syndrome. Today, low-dose paracetamol (Panadol) is recommended instead.
Applying a cold compress to the injection site may help relieve discomfort. If symptoms persist, paracetamol can be taken. If these measures are not effective, it is important to consult a doctor.