Table 6.
Percentage of influenza of all specimens analyzed at influenza centers, and its Type A, and Type B percentage by country and year
| Country | Year | Influenza | N | Percentage* % (95% CI) | Percentage type A** % (95% CI) | Percentage type B** % (95% CI) | ||
|---|---|---|---|---|---|---|---|---|
| All | Type A | Type B | ||||||
| Argentina | 1999 | 186 | 154 | 32 | 2616 | 7·11 (6·15–8·16) | 82·80 (76·59–87·92) | 17·20 (12·08–23·41) |
| 2000 | 454 | 398 | 56 | 21 116 | 2·15 (1·96–2·35) | 87·67 (84·28–90·55) | 12·33 (9·45–15·72) | |
| 2001 | 869 | 795 | 74 | 21 152 | 4·11 (3·84–4·38) | 91·48 (89·43–93·25) | 8·52 (6·75–10·57) | |
| 2002 | 425 | 182 | 243 | 18 719 | 2·27 (2·06–2·49) | 42·82 (38·07–47·68) | 57·18 (52·32–61·93) | |
| 2003 | 1323 | 1304 | 19 | 28 076 | 4·71 (4·47–4·97) | 98·56 (97·77–99·13) | 1·44 (0·87–2·23) | |
| 2004 | 1130 | 990 | 140 | 30 593 | 3·69 (3·49–3·91) | 87·61 (85·55–89·48) | 12·39 (10·52–14·45) | |
| 2005 | 894 | 779 | 115 | 29 019 | 3·08 (2·88–3·29) | 87·14 (84·76–89·26) | 12·86 (10·74–15·24) | |
| 2006 | 716 | 560 | 156 | 28 921 | 2·48 (2·30–2·66) | 78·21 (75·01–81·18) | 21·79 (18·82–24·99) | |
| 2007 | 986 | 953 | 33 | 30 845 | 3·20 (3·00–3·40) | 96·65 (95·33–97·69) | 3·35 (2·31–4·67) | |
| 2008 | 781 | 448 | 333 | 18 628 | 4·19 (3·91–4·49) | 57·36 (53·81–60·86) | 42·64 (39·14–46·19) | |
| Brazil | 1999 | – | 47 | 6 | – | – | 88·68 (76·97–95·73) | 11·32 (4·27–23·03) |
| 2001 | – | 16 | 20 | – | – | 44·44 (27·94–61·90) | 55·56 (38·10–72·06) | |
| 2002 | – | 12 | 31 | – | – | 27·91 (15·33–43·67) | 72·09 (56·33–84·67) | |
| 2003 | 101 | 97 | 4 | 1080 | 9·35 (7·68–11·25) | 96·04 (90·17–98·91) | 3·96 (1·09–9·83) | |
| 2004 | 157 | 126 | 31 | 1939 | 8·10 (6·92–9·40) | 80·25 (73·16–86·17) | 19·75 (13·83–26·84) | |
| 2005 | 99 | 57 | 42 | 2350 | 4·21 (3·44–5·11) | 57·58 (47·23–67·45) | 42·42 (32·55–52·77) | |
| 2006 | 239 | 187 | 52 | 3131 | 7·63 (6·73–8·62) | 78·24 (72·47–83·30) | 21·76 (16·70–27·53) | |
| 2007 | 58 | 39 | 19 | 4457 | 1·30 (0·99–1·68) | 67·24 (53·66–78·99) | 32·76 (21·01–46·34) | |
| 2008 | 298 | 169 | 129 | 3918 | 7·61 (6·79–8·48) | 56·71 (50·87–62·41) | 43·29 (37·59–49·13) | |
| Chile | 1999 | 113 | 21 | – | 84·33 (77·05–90·03) | 15·67 (9·97–22·95) | ||
| 2000 | 356 | 347 | 9 | 2749 | 12·95 (11·72–14·26) | 97·47 (95·26–98·84) | 2·53 (1·16–4·74) | |
| 2001 | 585 | 1206 | 218 | 19 232 | 3·04 (2·80–3·29) | 84·69 (82·71–86·52) | 15·31 (13·48–17·29) | |
| 2002 | 554 | 536 | 49 | 19 912 | 2·78 (2·56–3·02) | 91·62 (89·08–93·74) | 8·38 (6·26–10·92) | |
| 2003 | 1037 | 553 | 1 | 24 137 | 4·30 (4·04–4·56) | 99·82 (99·00–100·00) | 0·18 (0·00–1·00) | |
| 2004 | 914 | 873 | 164 | 23 626 | 3·87 (3·63–4·12) | 84·19 (81·82–86·35) | 15·81 (13·65–18·18) | |
| 2005 | 710 | 744 | 170 | 24 858 | 2·86 (2·65–3·07) | 81·40 (78·72–83·87) | 18·60 (16·13–21·28) | |
| 2006 | 799 | 676 | 34 | 24 029 | 3·33 (3·10–3·56) | 95·21 (93·37–96·66) | 4·79 (3·34–6·63) | |
| 2007 | 686 | 618 | 181 | 20 125 | 3·41 (3·16–3·67) | 77·35 (74·28–80·21) | 22·65 (19·79–25·72) | |
| 2008 | 56 | 643 | 43 | 405 | 13·83 (10·62–17·58) | 93·73 (91·65–95·43) | 6·27 (4·57–8·35) | |
| Colombia | 1999 | 32 | 53 | 3 | 488 | 6·56 (4·53–9·13) | 94·64 (85·13–98·88) | 5·36 (1·12–14·87) |
| 2000 | 21 | 32 | 0 | 414 | 5·07 (3·17–7·65) | 100·00 (89·11–100·00) | 0·00 (0·00–10·89) | |
| 2002 | 31 | 22 | 9 | 517 | 6·00 (4·11–8·40) | 70·97 (51·96–85·78) | 29·03 (14·22–48·04) | |
| 2003 | 67 | 66 | 1 | 381 | 17·59 (13·90–21·79) | 98·51 (91·96–99·96) | 1·49 (0·04–8·04) | |
| 2004 | 67 | 22 | 45 | 712 | 9·41 (7·37–11·80) | 32·84 (21·85–45·40) | 67·16 (54·60–78·15) | |
| 2005 | 77 | 70 | 7 | 972 | 7·92 (6·30–9·80) | 90·91 (82·16–96·27) | 9·09 (3·73–17·84) | |
| 2006 | 49 | 47 | 2 | 617 | 7·94 (5·93–10·36) | 95·92 (86·02–99·50) | 4·08 (0·50–13·98) | |
| Costa Rica | 2008 | – | – | – | 2482 | 0·97 (0·62–1·44) | – | – |
| Ecuador | 2007 | – | 40 | 2 | – | – | 95·24 (83·84–99·42) | 4·76 (0·58–16·16) |
| El Salvador | 2006 | 22 | – | – | 398 | 5·53 (3·50–8·25) | – | – |
| 2008 | 24 | – | –– | 369 | 6·50 (4·21–9·52) | – | – | |
| French Guiana | 2002 | 72 | 68 | 4 | 273 | 26·37 (21·25–32·02) | 94·44 (86·38–98·47) | 5·56 (1·53–13·62) |
| 2008 | 27 | 6 | – | 81·82 (64·54–93·02) | 18·18 (6·98–35·46) | |||
| Honduras | 2007 | 5 | – | – | 139 | 3·60 (1·18–8·19) | – | – |
| 2008 | 6 | – | – | 256 | 2·34 (0·86–5·03) | –– | – | |
| México | 2000 | 568 | 546 | 22 | 3731 | 15·22 (14·09–16·42) | 96·13 (94·19–97·56) | 3·87 (2·44–5·81) |
| 2001 | 83 | 81 | 2 | 991 | 8·38 (6·73–10·28) | 97·59 (91·57–99·71) | 2·41 (0·29–8·43) | |
| 2002 | 108 | 61 | 47 | 1655 | 6·53 (5·38–7·82) | 56·48 (46·60–66·00) | 43·52 (34·00–53·40) | |
| 2003 | 376 | 357 | 19 | 3098 | 12·14 (11·01–13·34) | 94·95 (92·22–96·93) | 5·05 (3·07–7·78) | |
| 2004 | 61 | 27 | 34 | 2375 | 2·57 (1·97–3·29) | 44·26 (31·55–57·55) | 55·74 (42·45–68·45) | |
| 2005 | 297 | 274 | 23 | 2721 | 10·92 (9·77–12·15) | 92·26 (88·61–95·03) | 7·74 (4·97–11·39) | |
| 2006 | 97 | 49 | 48 | 4189 | 2·32 (1·88–2·82) | 50·52 (40·17–60·83) | 49·48 (39·17–59·83) | |
| 2007 | 389 | 351 | 38 | 5497 | 7·08 (6·41–7·79) | 90·23 (86·84–92·99) | 9·77 (7·01–13·16) | |
| 2008 | 126 | 110 | 16 | 5232 | 2·41 (2·01–2·86) | 87·30 (80·20–92·56) | 12·70 (7·44–19·80) | |
| Panama | 2007 | 71 | 52 | 19 | 612 | 11·60 (9·17–14·41) | 73·24 (61·41–83·06) | 26·76 (16·94–38·59) |
| 2008 | 83 | 65 | 18 | 957 | 8·67 (6·97–10·64) | 78·31 (67·91–86·61) | 21·69 (13·39–32·09) | |
| Paraguay | 2000 | 38 | 0 | – | 100·00 (90·75–100·00) | 0·00 (0·00–9·25) | ||
| 2001 | 91 | 39 | 52 | 261 | 34·87 (29·09–40·99) | 42·86 (32·53–53·66) | 57·14 (46·34–67·47) | |
| 2002 | 31 | 15 | 16 | 150 | 20·67 (14·49–28·03) | 48·39 (30·15–66·94) | 51·61 (33·06–69·85) | |
| 2003 | 37 | 31 | 6 | 15 516 | 0·24 (0·17–0·33) | 83·78 (67·99–93·81) | 16·22 (6·19–32·01) | |
| 2004 | 118 | 111 | 7 | 1317 | 8·96 (7·47–10·63) | 94·07 (88·16–97·58) | 5·93 (2·42–11·84) | |
| 2005 | 83 | 75 | 8 | 1089 | 7·62 (6·12–9·36) | 90·36 (81·89–95·75) | 9·64 (4·25–18·11) | |
| 2008 | 17 | – | – | 936 | 1·82 (1·06–2·89) | – | – | |
| Peru | 2002 | 623 | 377 | 246 | 896 | 69·53 (66·40–72·53) | 60·51 (56·55–64·37) | 39·49 (35·63–43·45) |
| 2003 | 757 | 637 | 120 | 1912 | 39·59 (37·39–41·82) | 84·15 (81·35–86·68) | 15·85 (13·32–18·65) | |
| 2004 | 435 | 350 | 85 | 1874 | 23·21 (21·32–25·19) | 80·46 (76·42–84·08) | 19·54 (15·92–23·58) | |
| 2005 | 394 | 374 | 20 | 1729 | 22·79 (20·83–24·84) | 94·92 (92·27–96·87) | 5·08 (3·13–7·73) | |
| 2006 | 131 | 114 | 17 | 2610 | 5·02 (4·21–5·93) | 87·02 (80·04–92·26) | 12·98 (7·74–19·96) | |
| 2007 | 84 | 59 | 25 | 2370 | 3·54 (2·84–4·37) | 70·24 (59·27–79·73) | 29·76 (20·27–40·73) | |
| 2008 | 119 | 86 | 33 | 2184 | 5·45 (4·53–6·48) | 72·27 (63·32–80·08) | 27·73 (19·92–36·68) | |
| Uruguay | 2002 | 10 | 24 | – | 29·41 (15·10–47·48) | 70·59 (52·52–84·90) | ||
| 2003 | 83 | 80 | 3 | 305 | 27·21 (22·30–32·58) | 96·39 (89·80–99·25) | 3·61 (0·75–10·20) | |
| 2004 | 46 | 36 | 10 | 432 | 10·65 (7·90–13·95) | 78·26 (63·64–89·05) | 21·74 (10·95–36·36) | |
| 2005 | 117 | 86 | 31 | 275 | 42·55 (36·63–48·62) | 73·50 (64·55–81·23) | 26·50 (18·77–35·45) | |
| 2006 | 54 | 52 | 2 | 151 | 35·76 (28·14–43·96) | 96·30 (87·25–99·55) | 3·70 (0·45–12·75) | |
| 2007 | 66 | 58 | 8 | 516 | 12·79 (10·03–15·98) | 87·88 (77·51–94·62) | 12·12 (5·38–22·49) | |
| 2008 | 80 | 35 | 45 | 376 | 21·28 (17·25–25·76) | 43·75 (32·68–55·30) | 56·25 (44·70–67·32) | |
| Venezuela | 2004 | 12 | – | – | 186 | 6·45 (3·38–11·00) | – | – |
| 2006 | 52 | 32 | 20 | 787 | 6·61 (4·97–8·57) | 61·54 (47·02–74·70) | 38·46 (25·30–52·98) | |
*The denominator is the number of specimens received by influenza centers.
**The denominator is the number of specimens positive for influenza.