As you've discovered, mono
can elude diagnosis in its early stages, as it can mimic other illnesses (viral infections
, strep throat
, etc.). It takes 10 to 14 days for your immune system to produce antibodies to the virus
that causes mono, so ordering the blood test when you first get sick is of little value.
Now, most adults already have antibodies to ebv
-- the mono virus -- so they're immune to reinfection. However, an occasional adult does fall ill with mono, and they're treated just like younger people who catch this disease. Sharing utensils and water glasses
is one way to spread mono, and this practice should be avoided, just as it should be whether you feel ill or not (a wide array of infections -- not just mono -- can be spread by sharing water glasses, bottles, spoons, etc.). Once you're exposed to mono, if you're not already immune there's little you can do to prevent the infection from occurring.
Without a blood test there's no way to determine if your father is immune to mono. At this point, just practice good hygiene: wash your hands frequently, cough
or sneeze into your hand, sleeve, or handkerchief, and don't share personal items with other people.
I hope you feel better soon!