An abnormally high body temperature, usually accompanied by shivering, headache, and in severe instances, delirium.
In adults and children, fever means a temperature of above 37.6C (99,68 F) or higher. Normal body temperature is widely cited as 37C (98.6 F) but it varies from person to person, ranging from 36.1C (97F) to 37.2C (99F).
Fever can be caused by infections (such as influenza, malaria), in reaction to a medication or a vaccine, inflammatory disease, and in rarer cases, some kinds of cancers. Fever is one of the main symptoms of infection by SARS-CoV-2, the virus that causes COVID-19. A raised temperature after receiving a vaccine is considered a mild adverse event and indicates that the body’s immune system is responding to the vaccine.
Immune System Symptoms