Table 2.
Cases of medically attended acute respiratory illness*(MAARI) and characteristics of confirmed influenza cases among crew on Ships A and B
| Ship A: n (%) | Ship B: n (%) | |
|---|---|---|
| Crew | 1,057 | 1,157 |
| MAARI (n/crew) | 33 (3.1) | 54 (4.7) |
| Age (median, range) (n=MAARI) |
33 (23–49) | 31.5 (22–61) |
| Male (n/MAARI) | 22/33 (66.7) | 37/54 (68.5) |
| Comorbid risk factor†
(n/MAARI) |
0/33 (0) | Data unavailable |
| Received influenza vaccination (n/MAARI) |
31/33 (93.9) | 54/54 (100) |
| Occupation category (n/MAARI) | ||
| Food service | 19/33 (57.6) | 21/54 (38.9) |
| Entertainment | 4/33 (12.1) | 6/54 (11.1) |
| Accommodation | 2/33 (6.1) | 10/54 (18.5) |
| Other | 8/33 (24.2) | 17/54 (31.5) |
| Crew tested (n/MAARI) |
10/33 (30.3) | 6/54 (11.1) |
| Laboratory-confirmed influenza (n/tested) |
4/10 (40.0) | 1/6 (16.7) |
Medically attended acute respiratory illness includes case of influenza-like illness and acute respiratory illness.
Comorbid risk factors include persons with chronic pulmonary conditions (including asthma); cardiovascular disease (except hypertension alone); renal, hepatic, or hematologic (including sickle cell) disease; metabolic disorders (including diabetes mellitus); or neurologic and neurodevelopment conditions [including disorders of the brain, spinal cord, peripheral nerve, and muscle, such as cerebral palsy, epilepsy (seizure disorders), stroke, intellectual disability (mental retardation), moderate to severe developmental delay, muscular dystrophy, or spinal cord injury]; persons with immunosuppression, including that caused by medications or by human immunodeficiency virus infection.