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1
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No increase in susceptibility to infection before age 10
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2
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Infection frequency greater than unaffected population before age 10, but not significantly impairing (not requiring hospitalization), such as ear infections and sinusitis, or a case of mild pneumonia not requiring hospitalization (as described by a clinician)
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3
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Frequent and more serious infections before age 10, such as at least one serious pneumonia (e.g. requiring hospitalization), chronic bronchitis, and/or chronic sinusitis refractory to treatment
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4
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Same as category 3, but serious infections starting before the 2nd birthday
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