My Grandson Was Just Diagnosed Today With Pneumonia. He Is

My grandson was just diagnosed today with pneumonia. He is 24 years old. He is in the masters program at UC for architecture and lives in an apartment with a VERY old window A/C. Another student in the building watched the olympics with my grandson and he has walking pneumonia. They were both in the apartment with the 25+ year old window A/C. Any coincidenc?