Table 5.
Estimated influenza illnesses averted through influenza vaccination among pregnant women, El Salvador (2015–2017), Panama (2015–2017), and Peru (2017–2018).
| Year | Prevented fraction1 | Hospitalized illnesses |
Medically-attended illnesses |
Overall illnesses2 |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| # illnesses | # averted (95 % Cl) | NNV (95 % Cl) | # illnesses | # averted (95 % Cl) | NNV (95 % Cl) | # illnesses | # averted (95 % Cl) | NNV (95 % Cl) | ||
|
| ||||||||||
|
El Salvador 2015 |
9.5 % (2.2 %, 31.5 %) | 159 | 17 (3, 73) | 2386 (625, 10944) | 4600 | 482 (102, 2124) | 82 (21, 375) | 12,331 | 1291 (271, 5670) | 31 (8, 140) |
| 2016 | 0.2 % (0.1 %, 0.7 %) | 177 | 0 (0, 1) | 2365 (813, 9850) | 5114 | 13 (3, 37) | 82 (28, 343) | 13,711 | 34 (8, 100) | 30 (11, 129) |
| 2017 | 1.5 % (0.3 %, 4.2 %) | 177 | 3 (1, 8) | 2329 (771, 10287) | 5131 | 76 (17, 226) | 80 (27, 352) | 13,756 | 203 (46, 604) | 30 (10, 133) |
|
Panama 2015 |
10.9 % (2.5 %, 32.1 %) | 131 | 16 (3, 64) | 2340 (601, 10963) | 2901 | 353 (75, 1377) | 106 (28, 491) | 7778 | 947 (202, 3677) | 40 (10, 184) |
| 2016 | 0.4 % (0.1 %, 1.3 %) | 148 | 1 (0, 2) | 2304 (760, 10210) | 3261 | 13 (3, 43) | 104 (35, 452) | 8742 | 36 (8, 114) | 39 (13, 171) |
| 2017 | 3.4 % (0.8 %, 9.9 %) | 143 | 5 (1, 16) | 2344 (737, 10025) | 3151 | 110 (26, 344) | 106 (34, 442) | 8449 | 295 (71, 927) | 40 (13, 166) |
|
Peru 2017 |
8.2 % (1.9 %, 24.7 %) | 1069 | 96 (21, 354) | 2381 (665, 10580) | 29,933 | 2685 (590, 9825) | 85 (24, 383) | 80,248 | 7198 (1590, 26317) | 32 (9, 142) |
| 2018 | 3.3 % (0.8 %, 11.0 %) | 1040 | 36 (8, 127) | 2542 (809, 11127) | 69,000 | 2390 (524, 8490) | 38 (12, 169) | 184,987 | 6408 (1409, 22842) | 14 (5, 63) |
CI = confidence interval; NNV = number needed to vaccinate; overall illness is defined as all influenza illnesses (both medically-attended and non-medically-attended).
1
Prevented fraction calculated as the number of events avoided among the vaccinated population divided by the estimated number of events that would have occurred in the absence of a vaccination program.
2
Overall illnesses include medically and non-medically attended illnesses.