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Common allergens and viruses may act together to exacerbate asthma.
Green and colleagues (p 763) found that 66% of patients admitted to
hospital with asthma were sensitised and exposed to house dust mite or
cat or dog allergens compared with patients with stable asthma (37%)
and inpatient controls (15%). They suggest that domestic exposure to
allergens acts synergistically with viruses in sensitised patients,
increasing the risk of hospital admission.

(Credit: HARTLEY/REX) 
(Credit: BURGESS/SPL)