Seems to be related to the mystery hepatitis in UK that was on HN a few days ago. Adenovirus 41 one of the main viruses that typically causes the “stomach flu”

Seems to be related to the mystery hepatitis in UK that was on HN a few days ago. Adenovirus 41 one of the main viruses that typically causes the “stomach flu”/gastrointestinal sickness. If this is the cause, that seems a bit worrisome. Did the virus mutate? And if so, naturally or synthetically?