I am going to try to keep vague as this may be outing. My 3 yo DD has Cystic Fibrosis, and after 3 years most of my family still don't seem to take it seriously.
She has to be very careful about certain environmental bugs and there are so places/things we have to avoid as the risks are too high.
Catching the common cold or a cough can be very hard for her to shift as the mucus she creates is thick and sticky and hard to cough up so she has had many hospitilisations of 2 weeks each time just to shift a cough. When she does start coughing she immediatley has to go to a high strength anti-biotic for 2 weeks, this is all to prevent permanent lung damage caused by the infections, and it is this damage which ultimatley shortens the life span of sufferers.
We have to avoid coughs and colds for this reason, obviously with her starting school in a few years (September baby) this is less avoidable but at present we ask that anyone with a cold (even just a sniffle to them) or cough does not come to our house, or if planned to see them they can let us know and we rearrange. Most of my friends are excellent with this.
The last time DD caught a cold the cough went on for 6 weeks and I was up giving physiotherapy (patting of the chest/back/sides) throughout the day and night as she could not bring it up and was so poorly.
I generally avoid big gatherings where possible but do like DD to know her extended family of great grandparents, my aunts, uncles and 2nd cousins. However almost everytime there is someone unwell who will come and not let me know. At christmas her aunt came to our house with a chest infection and just said she wouldn't cough near her, we recently had a family birthday party and the first thing a family member said as we walked through the door was x has a heavy cold, I have told him to keep away from DD though.
I am getting so fed up with this despite me telling them all over and over the importance that they just dont seem to care and I want to avoid now!!