Around 5 million people worldwide live with the autoimmune condition lupus. This condition can cause a range of symptoms, including tiredness, fever, joint pain and a characteristic butterfly-shaped rash across the cheeks and nose.

For some people, these symptoms are mild and only flare-up occassionally. But for others, the disease is more severe – with constant symptoms

Although researchers know that lupus is caused by the immune system mistakenly attacking the body’s own tissues and organs, it isn’t entirely clear what triggers this response. But a new study suggests a common virus may play a key role in lupus.

There are two main forms of lupus. Discoid lupus primarily affects the skin, while systemic lupus erythematosus – the most common form of lupus – is more severe and affects the organs.

The immune system’s B cells play a key role in systemic lupus. B cells normally produce proteins called antibodies to target pathogens such as viruses and bacteria. But in people with systemic lupus, some B cells produce antibodies, called autoantibodies, that instead bind to and damage their own organs.

What causes B cells to produce autoantibodies in people with systemic lupus is poorly understood. But this recent study suggests that the trigger may be a common virus.

Epstein-Barr virus (EBV) infects most people worldwide. Infection with EBV most commonly occurs in childhood, when it usually goes unnoticed. But if a person becomes infected by EBV in adolescence, it can cause infectious........

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