Table 1.
The number of samples and the seroprevalence obtained for each age‐group at each time point during and after the pandemic
| Age‐group | Months | |||||||
|---|---|---|---|---|---|---|---|---|
| 6–7/2009 | 8–9/2009 | 10–11/2009 | 12/09–1/10 | 2–3/2010 | 4–5/2010 | 6–7/2010 | 8–9/2010 | |
| 0–9 years | ||||||||
| n | 60 | 60 | 60 | 129 | 95 | 116 | 100 | 100 |
| % Positivea | 0 | 11·7 (3·5–19·8) | 16·7 (7·2–26·1) | 46·5 (37·9–55·1) | 54·7 (44·7–64·8) | 43·1 (34·1–52·1) | 45·0 (35·3–54·8) | 40·0 (30·4–49·6) |
| GMTb | 10·1 (9·9–10·3) | 13·3 (11·0–16·2) | 15·3 (11·9–19·6) | 32·1 (25·4–40·5) | 54·7 (38·7–77·5) | 31·3 (24·6–39·8) | 31·4 (24·2–40·6) | 27·7 (21·5–35·7) |
| 10–19 Years | ||||||||
| n | 60 | 60 | 60 | 168 | 110 | 141 | 100 | 108 |
| % Positivea | 15·0 (5·9–24·0) | 18·3 (8·5–28·1) | 33·3 (21·4–45·3) | 44·0 (36·5–51·6) | 60·9 (51·8–70·0) | 59·6 (51·5–67·7) | 65·0 (55·7–74·4) | 57·4 (48·1–66·7) |
| GMTb | 15·7 (12·1–20·3) | 14·5 (12·1–17·2) | 26·4 (18·8–37·0) | 37·4 (29·8–47·0) | 56·9 (42·3–76·6) | 54·5 (42·2–70·3) | 55·0 (42·1–71·9) | 50·7 (38·1–67·5) |
| 20–49 Years | ||||||||
| n | 178 | 177 | 169 | 200 | 186 | 243 | 296 | 292 |
| % Positivea | 7·9 (3·9–11·8) | 10·2 (5·7–14·6) | 14·2 (8·9–19·5) | 31·5 (25·1–37·9) | 30·1 (23·5–36·7) | 21·8 (16·6–27·0) | 28·4 (23·2–33·5) | 26·4 (21·3–31·4) |
| GMTb | 12·2 (11·1–13·5) | 13·5 (12·0–15·2) | 14·3 (12·8–16·1) | 22·2 (18·7–26·3) | 24·9 (20·5–30·3) | 18·7 (16·3–21·5) | 20·7 (18·1–23·7) | 18·7 (16·8–20·9) |
| 50–79 Years | ||||||||
| n | 174 | 179 | 176 | 195 | 216 | 257 | 256 | 248 |
| % Positivea | 4·0 (1·1–6·9) | 7·3 (3·5–11·1) | 8·5 (4·4–12·7) | 16·9 (11·7–22·2) | 20·8 (15·4–26·3) | 19·1 (14·3–23·9) | 15·6 (11·2–20·1) | 10·5 (6·7–14·3) |
| GMTb | 11·1 (10·6–11·7) | 12·1 (11·2–13·0) | 13·1 (12·0–14·3) | 15·8 (13·8–18·0) | 18·3 (15·7–21·2) | 16·3 (14·4–18·4) | 14·4 (13·2–15·9) | 13·6 (12·5–14·9) |
| 80 Years+ | ||||||||
| n | 28 | 24 | 35 | 35 | 41 | 43 | 48 | 52 |
| % Positivea | 21·4 (6·2–36·6) | 41·7 (21·9–61·4) | 42·9 (26·5–59·3) | 45·7 (29·2–62·2) | 46·3 (31·8–61·6) | 53·5 (38·6–68·4) | 39·6 (25·8–53·4) | 32·7 (19·9–45·4) |
| GMTb | 16·8 (12·3–22·9) | 22·2 (14·4–34·3) | 22·5 (16·6–30·5) | 28·6 (18·9–43·1) | 35·5 (25·0–50·5) | 36·3 (24·6–53·6) | 27·5 (19·8–38·2) | 21·7 (16·4–28·6) |
a
Data are % (95% confidence interval).
b
Geometric mean titer (95% confidence interval).