Well let's first discern between those who have been surprisingly injured and those who have been consistently over the last couple of seasons.
Camo, CZ, Trezz, Legro, have all usually been injury prone before, and it's no surprise that as they're aging they're also getting more injury prone and taking longer to recover. This is something the management have to look seriously into, we really cannot rely on CZ as a starter if he is barely going to play all season due to injuries. The same can be said of Camo, and it's really hurting us because he is such an integral player.
Where something is suspect is when it comes to the other players, Poulsen, Iaquinta, Mellberg, and so on are not known to be injury prone from what i know, so it does seem something within our training regime is probably putting too much pressure on our players. I agree with raul duke, it's not as if suddently Agricola has lost his ability as a physician, that seems very unlikely. What is likely is that Ranieri's methods are probably too strenuous and/or the players' training schedule does not allow them to recuperate enough.