A viral attack on the airways can lead to potentially fatal secondary infections.

By Tom Ewing

In most respects, your cat is in perfect health — except for one very troubling matter: Every four or five months, she goes through phases of serious physical distress, with signs that include wheezing, sneezing, nasal congestion and watery eyes. These debilitating signs persist for a week or 10 days — and then abruptly disappear. What in the world could be wrong with her?

Clearly, the animal is suffering from an upper respiratory infection (URI), a disease affecting the nose, sinuses, pharynx and larynx — the structures that filter, heat and humidify inhaled air before it flows to the lungs. In your cat’s case, the condition is probably attributable to a…

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