Zebre led at half-time of their European Challenge Cup match at La Rochelle, but the hosts fought back in stunning fashion on Friday.
Joey Carbery, Rory Scannell, Keith Earls and Andrew Conway were among the tries as Munster overpowered Gloucester.
Returning to action after a broken arm proved an anxious experience for Saracens' Billy Vunipola, who is steadily regaining his poise.
Bill Beaumont, chairman of World Rugby, hailed the progress made on injury-prevention in the sport but acknowledged more needs to be done.
Three weeks before the start of the Six Nations, Sam Underhill has been ruled out of the tournament in a significant blow to England.
Two-time World Rugby Player of the year Beauden Barrett says John Plumtree has the potential to coach the All Blacks.
Clermont Auvergne hammered fellow title hopefuls La Rochelle, who had won 10 of their previous 11 matches.
Wasps won for only the second time since September with a fit-again Joe Launchbury back in the side.
Zebre were no match for Pro14 rivals Cheetahs on Sunday as the South African side eased to a bonus-point victory on the road.
Bath finished the game with 11 men as they suffered defeat to lowly Worcester Warriors in the 98th minute.
Saracens welcomed Billy Vunipola back for Friday's trip to Sale Sharks but he could not inspire them to Premiership victory.
Having not played since November 10 due to ongoing concussion issues, Leigh Halfpenny appears to be a doubt for Wales' Six Nations campaign.
England coach Eddie Jones has been given a boost ahead of the Six Nations, with Billy Vunipola and Joe Launchbury to return for their...
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Mark Wilson has signed a new four-year contract with Newcastle Falcons after some brilliant displays for England in November.
England's Sam Underhill will undergo a specialist review after suffering ankle ligament damage and could miss the start of the Six Nations.
Jason Tovey's late penalty gave the Dragons a first win over the Ospreys since Boxing Day 2014.