The first allergic reaction generally cannot be avoided. However, the best way to prevent a second attack is by avoiding the trigger. This can be difficult in some cases, especially with common substances. id="1876" pub="1" type="medenc"> Breast-feeding instead of bottle-feeding is thought to reduce the chance of a child having certain food allergies.
An allergic reaction has no long-term effects if the trigger is avoided. Many allergies are mild and pose little threat to the affected person. Some allergies are life threatening and may cause death.
Allergic reactions are not contagious and pose no risk to others.