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England put themselves in prime position to win the Six Nations with a laboured bonus-point win against Italy.
England came out with renewed intensity after the break and Youngs capitalised with his second score.
The visitors then found their rhythm, with 50-cap Jamie George, Tom Curry and Henry Slade all crossing.
England will have to wait until France v Ireland is completed to learn whether they have won a first Six Nations title since 2017.
Ireland will be crowned champions if they win with a bonus point or by more than six points in Paris, while France can claim the title with a bonus-point victory and a winning margin of more than 31.
Result:Italy 5-34 England.
Meanwhile Scotland celebrated a Six Nations win in Wales for the first time in 18 years with victory in Llanelli.
Replacement Scotland hooker Stuart McInally scored a second-half try and Stuart Hogg added a late penalty to seal victory.
Wales captain Alun Wyn Jones finished on the losing side as he became the world's most capped international player on his 149th Test appearance.
Result:Wales 10-14 Scotland.