Table 4. Clinical Cases of 2009 Pandemic Influenza A (H1N1) by Case Definition.
| Clinical Case Definition | Camp Outbreaka | Household Outbreakb | |||||
|---|---|---|---|---|---|---|---|
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| Age | Age | ||||||
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| Total (n = 96) AR (%)No. Cases | ≤17 years (n = 79) AR (%) No. Case s | ≥18 years (n = 17) AR (%) No. Cases | Total No. Cases/No. Contacts AR (%) | ≤17 years No. Cases/No. Contacts AR (%) | ≥18 years No. Cases/No. Contacts AR (%) | No. Households | |
| I | 49 (51) | 44 (56) | 5 (29) | 11/136 (8) | 7/48 (15) | 4/88 (5) | 41 |
| II | 66 (69) | 56 (71) | 10 (59) | 18/175 (10) | 10/65 (15) | 8/110 (7) | 54 |
| III | 57 (59) | 51 (65) | 6 (35) | 15/156 (10) | 10/56 (18) | 5/100 (5) | 48 |
| IV | 43 (45) | 40 (51) | 3 (18) | 9/132 (7) | 6/47 (13) | 3/85 (4) | 39 |
| V | 46 (48) | 42 (53) | 4 (24) | 11/127 (9) | 7/44 (16) | 4/83 (5) | 39 |
| VI | 36 (38) | 34 (43) | 2 (12) | 7/109 (6) | 5/38 (13) | 2/71 (3) | 32 |
a
There were 2 camp index cases for all case definitions except for case definition II for which there were 7.
b
Case definitions I, II, III, and V include 1 household with 2 camp participants who were both considered index cases.
AR indicates illness attack rate, expressed as a percent.