Yes it's hard to say as these dates also coincide with the flu season. It does make you think though. I was in Tenerife over Christmas and returned the 11th January. I started feeling Ill just before I left then I was absolutely wiped out when I got home. High fever cough and absolutely no energy. I slept for almost four days, just drinking liquid and going to the toilet in between but no food. The apartment I rented was owned by an Italian too. Nobody knows of course, still can't completely shake the cough off though.