If you have an infection in your knee then it is likely very vulnerable to damage and you need to give it all the time it needs to recover and re-strengthen.
I once had a deep infection get into my elbow - an innocuous scratch that became infected and had me in extreme pain and fever, it was treated successfully with antibiotics (pills, not hospital IV). Once I felt better ( probably a week or so after the antibiotices) I was orienteering, jumped off a small crag, slipped and fell on one hand, holding myself up with hand / arm. Extreme agony as the tendon in my elbow tore a sliver of bone off my elbow joint - the bone having been weakened by the previous infection and not fully recovered its integrity and strength.
As a runner you need your knees more than your elbow.
Yeah you might get bored, but not worth rushing back
Have to say I agree. I also got an infection in my elbow after falling at the 6 days a few years ago. I thought I'd cleaned out the wound, but I hadn't done it well enough. It came back twice over the following 6 months after it seemed to be all cleared up with antibiotics.
Thanks for the warnings and stories, knee certainly felt a bit fragile trying to jog around a bit today, even though the swelling has almost gone now. I'll have to accept that full six-day participation is well off the cards and instead I'll carefully pick and choose a few days, if any.
Take it as a long rest and recuperation period and do some serious long-term planning - it will pay off.