And it's the dust mites people are allergic to. Dust mites just love these conditions. Open the windows and vacuum frequently. Yes, it seems that nowadays people generally are suffering from more and more allergies. Many people suffer from food allergies - they're allergic to certain food products, like nuts, wheat, or milk.
Some food allergies can be fatal.
Another common source of allergy is dust and pollen. Modern living seems to produce more dust and therefore more dust mites, horrible little creatures, which live in the dust. They love thick carpets, double-glazing and central heating. So - remember, open the windows and vacuum frequently. People can be also allergic to drugs - penicillin, for example.