Is it possible for OAK TREE POLLEN to cause symptoms of LARYNGITIS if a person was hit in the face with it ?

My neighbor was sitting on his deck, when a sudden gust of wind blew a big wad of the stuff, off his roof, and it hit him in the face.

The next morning he lost his voice and could only speak in a whisper, as in LARYNGITIS, and had some slight dificulty in exhaling, especially while trying to speak. He also has the feeling that he needs to clear his throat, but coughing (on purpose) does not produce any significant amount of phlegm.

He otherwise feels fine, has no pain involved with speaking, and his doctor could not find anything wrong, and prescribed some steroids. There has been no change in a month's time.

I know many people are allergic to the Oak pollen, but he said he has no allergies.

Does anyone know if Oak Tree Pollen could produce such effects, if a LARGE DOSE of it was accidentally inhaled?

Has anything like this happend to anyone else ?

Thanks for your response !