Table 1.
ELISA IgG, IFA IgG, and MN/PRN borderline and positive samples by years of collection and age group. Data on sex and age group of collected and positive samples were summarized as counts and percentages and 95% confidence intervals were calculated.
| Study Population | 2016–2017 | 2018–2019 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M | F | Total | ELISA IgG | IFA IgG | MN/PRN | M | F | Total | ELISA IgG | IFA IgG | MN/PRN | |
| 20–60 years | 255 (43.8) |
327 (56.2) |
582 (66.2) |
10 (1.7%, 0.9–3.2) |
8 (1.4%, 0.65–2.7) |
3 (0.5%, 0.1–1.6) |
307 (50.1) |
306 (49.9) |
613 (66.6) |
6 (1.0%, 0.4–2.2) |
4 (0.65%, 0.2–1.7) |
3 (0.5%, 0.1–1.5) |
| >60 years | 161 (54.2) |
136 (45.8) |
297 (33.8) |
7 (2.4%, 1.05–4.9) |
4 (1.35%, 0.4–3.5) |
3 (1.0%, 0.2–3.1) |
154 (50.0) |
154 (50.0) |
308 (33.4) |
2 (0.65%, 0.0–2.5) |
2 (0.65%, 0.0–2.5) |
2 (0.65%, 0.0–2.5) |
| Total | 416 (47.3) |
463 (52.7) |
879 | 17 (1.9%, 1.2–3.1) |
12 (1.4%, 0.8–2.4) |
6 (0.7%, 0.3–1.5) |
461 (50.1) |
460 (49.9) |
921 | 8 (0.9%, 0.4–1.7) |
6 (0.65%, 0.3–1.45) |
5 (0.5%, 0.2–1.3) |
95% CI, 95% confidence interval; IFA, immunofluorescence assay; MN, micro neutralization; PRN, plaque reduction neutralization.