Another seasonal allergy peril comes from poinsettias.

As a consequence, a potential 14.5 million people could be underperforming at work because of their seasonal allergy, the charity says.

After 3 years or 3 seasons (if seasonal allergy) of successful completion of immunotherapy, long-term protection can be expected.

Indeed, seasonal allergies are one of the main triggers for asthma, along with colds or flu, cigarette smoke and exercise.

Among seasonal allergies, there are some allergens that fuse together and produce a new type of allergy.