Pulisic has had a BUNCH of injuries, two of which kept him out for much of last season, even before his hamstring died a hero as he charged in on goal in the FA Cup Final. Then he returned from that at long last after several months, and now got injured in warmups. Given what he's showed when healthy, if you're not frustrated by his injury streak (or injury luck, if you prefer), you've got superhuman optimism.
Chris Richards likewise got injured in warmups and pulled the other day. I think Dest had something a few weeks back. We've had lots of knocks going around. Tim Weah has been injured forever to the point where PSG gave up on him, and still hasn't hit the field for Lille. You don't have to poke around many threads here to see that the rate of injuries for our key players is quite high.
Now of course, I have no idea whether this is due to them being injury-prone, them being poorly prepared or ill-advised by trainers, or just freak occurrences, so I won't call it "a pattern", but I think at this point we can describe it as "a streak" of injuries.