I'm not panicking yet.
Whilst it could be Joe, Jack, Jimmy and Jacob, it could equally be Vailanu, Zuzu, Flament and Edwards.
The fact that three staff have tested positive suggests its more likely to be medical staff as they'd have closer contact with players more so than the coaches. That could mean the players who have tested positive are injured players and wouldn't be training with the full squad.
As Nelly alludes to, what impact does it have on Bristol? If they're fine, it's likely the players weren't involved on Saturday and would be unlikely to feature in the final.