Acute hepatitis of unknown origin in children is currently being reported worldwide,[A1]  especially in Europe and the United States.

Of the 163 cases in the UK outbreak, 126 were tested for adenovirus, 91 were detected, and 18 of the 33 cases with adenovirus in the blood were successfully subtyped, all of which were type 41, a well-known cause of acute gastroenteritis in children [1].

 [A1]I edited this part to improve conciseness. Using a long phrase when a shorter one will suffice can contribute to wordiness or vagueness.