<P> Rhinitis is very common . Allergic rhinitis is more common in some countries than others; in the United States, about 10%--30% of adults are affected annually . Mixed rhinitis (MR) refers to patients with nonallergic rhinitis and allergic rhinitis . MR is a specific rhinitis subtype . It may represent between 50 and 70% of all AR patients . However, true prevalence of MR has not been confirmed yet . </P> <P> Rhinitis is categorized into three types (although infectious rhinitis is typically regarded as a separate clinical entity due to its transient nature): (i) infectious rhinitis includes acute and chronic bacterial infections; (ii) nonallergic (vasomotor) rhinitis includes idiopathic, hormonal, atrophic, occupational, and gustatory rhinitis, as well as rhinitis medicamentosa (drug - induced); (iii) allergic rhinitis, triggered by pollen, mold, animal dander, dust, Balsam of Peru, and other inhaled allergens . </P> <P> Rhinitis is commonly caused by a viral or bacterial infection, including the common cold, which is caused by Rhinoviruses, Coronaviruses, and influenza viruses, others caused by adenoviruses, human parainfluenza viruses, human respiratory syncytial virus, enteroviruses other than rhinoviruses, metapneumovirus, and measles virus, or bacterial sinusitis, which is commonly caused by Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis . Symptoms of the common cold include rhinorrhea, sneezing, sore throat (pharyngitis), cough, congestion, and slight headache . </P> <P> Nonallergic rhinitis refers to rhinitis that is not due to an allergy . The category was formerly referred to as vasomotor rhinitis, as the first cause discovered was vasodilation due to an overactive parasympathetic nerve response . As additional causes were identified, additional types of nonallergic rhinitis were recognized . Vasomotor rhinitis is now included among these under the more general classification of nonallergic rhinitis . The diagnosis is made upon excluding allergic causes . It is an umbrella term of rhinitis of multiple causes, such as occupational (chemical), smoking, gustatory, hormonal, senile (rhinitis of the elderly), atrophic, medication - induced (including rhinitis medicamentosa), local allergic rhinitis, non-allergic rhinitis with eosinophilia syndrome (NARES) and idiopathic (vasomotor or non-allergic, non-infectious perennial allergic rhinitis (NANIPER), or non-infectious non-allergic rhinitis (NINAR). </P>

Most common type of virus leading to rhinitis
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