In the week beginning the 15 December 2020 PHW changed their most recent 7 days incidence from a lag of 37 hours from sample collection date to inclusion within this measure to 81 hours.
Yn y cyfnod cyn y pandemig ym mis Ionawr 2020, roedd ychydig o dan 7,000 o gleifion wedi aros am fwy na 12 awr, y nifer uchaf ers dechrau cofnodi hyn yn 2012.