Table 1 Clinico-epidemiological characteristics of SARI patients during the pre- and COVID-19 pandemic periods

Demographic characteristics

 Age

  18–30 years

1688 (20.55)

1153 (26.25)

535 (13.99)

  31–40 years

1133 (13.79)

565 (12.86)

568 (14.85)

  41–50 years

1228 (14.95)

579 (13.18)

649 (16.97)

  51–60 years

1486 (18.09)

731 (16.64)

755 (19.74)

    ≥ 60 years

2681 (32.63)

1364 (31.06)

1317 (34.44)

Median age (IQR), years

50 (32–60)

45 (28–60)

50 (35–60)

Male

5127 (62.40)

2783 (63)

2344 (61)

Clinical characteristics

 Runny nose

3186 (38.78)

1744 (39.71)

1442 (37.71)

 Headache

4597 (56)

2690 (61.25)

1907 (49.87)

 Sore throat

1736 (21.13)

993 (22.61)

743 (19.43)

 Difficulty breathing reported on admission

5542 (67.45)

2491 (56.72)

3051 (79.79)

 Body ache

4420 (53.80)

2474 (56.33)

1946 (50.89)

  ≥ 1 co-morbid condition (Self-reported)

3568 (43.43)

1760 (40)

1808 (47.28)

 Duration of symptoms prior to admission in days; median (IQR)

4 (3–6)

4 (2–5)

4 (3–6)

 Length of hospital stay in days; median (IQR)

3 (2–5)

3 (2–5)

3 (2–6)

Treatment received

 Antibiotic

6847 (83.34)

3257 (74.16)

3590 (93.88)

 Oxygen

3982 (48.54)

1248 (28.50)

2734 (71.51)

 Mechanical ventilation

23 (0.28)

17 (0.40)

6 (0.16)

 ICU support

28 (0.34)

19 (0.43)

9 (0.24)

Laboratory results

 SARS-CoV-2 detected

(n = 3816) ^$

1043 (27.33)

0 (0)

1043 (27.33)

 Influenza virus detected

1312 (16)

1010 (23)

294 (7.70)

Influenza virus types

 Influenza A

919 (70.05)

682 (67.52)

237 (78.48)

 Influenza B

393 (29.95)

328 (32.48)

65 (21.52)

 Influenza A and B

0 (0)

0 (0)

0 (0)

Subtypes of influenza A virus

 Influenza A(H1N1) pdm09

571 (43.52)

409 (40.50)

162 (53.64)

 Influenza A(H3N2)

339 (25.84)

264 (26.14)

75 (24.83)

 Influenza A(H5N1)

0 (0)

0 (0)

0 (0)

 Influenza A (inconclusive)^Ȳ

9 (0.7)

9 (0.89)

1 (0.2)

Clinical outcome

 Death (total)

785 (9.55)

264 (6.01)

521 (13.62)