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Poison oak recently nailed Becker’s left wrist and his right wrist flared up with a mild itch — the patch where poodle-dog swiped him about a decade ago.

An insidious but lesser-known consequence of even a mild measles infection is that it kills the very cells that remember which pathogens the patient has previously fought and how those battles were won.

Symptoms are typically mild for this form of MS, according to the NHS, but about half of cases can develop into a more progressive form of the disease.

Prof Zhou notes that though significant, the "wording in general is still relatively mild".

For most people, side effects are mild., external The most common include a sore arm, headache, chills, fatigue and nausea.