I wonder why they singled out A and E, shouldn't it be non-A, non-B, non-C, non-Delta, non-E hepatitis. It's been a long time since you could call hepatitis C "non-A, non-B hepatitis". Though this is in children, they probably should not be getting hepatitis C unless something has gone horribly wrong, so it might be okay to exclude that one, and hepatitis Delta is obscure, though is does show an analogue with this because the coinfecting "helper" with Delta is hepatitis B virus.
IIRC from the previous discussions, liver complications are more common following Hep-A or Hep-E infections. What was new about this wave of cases was liver complications without the known Hep A/E precursor.