Seasons
|
Lowest WSD week (a)
|
Peak week* (b)
|
Duration between (a) and (b), weeks
|
Prevalence of type or subtype of influenza virus in early phase of the season†
|
---|
| | | | |
A/H3N2
| |
A/H1N1
| |
B
|
---|
1999/2000
|
51st, 1999
|
5th, 2000
|
6
|
45.2%
|
A/Sydney/5/97
|
54.8%
|
A/New Caledonia/20/99
|
0.0%
|
-
|
2000/2001
|
48th, 2000
|
10th, 2001
|
14
|
14.3%
|
A/Panama/2007/99
|
43.4%
|
A/New Caledonia/20/99
|
42.3%
|
B/Sichuan/379/99
|
2001/2002
|
1st, 2002
|
8th, 2002
|
7
|
38.3%
|
A/Panama/2007/99
|
51.2%
|
A/New Caledonia/20/99
|
10.5%
|
B/Shandong/7/97
|
2002/2003
|
52nd, 2002
|
5th, 2003
|
5
|
85.4%
|
A/Fujian/411/2002
|
0.0%
|
-‡
|
14.6%
|
B/Shandong/7/97
|
2003/2004
|
52nd, 2003
|
6th,2004
|
6
|
98.6%
|
A/Fujian/411/2002
|
0.1%
|
-
|
1.3%
|
B/Shanghai/361/2002
|
2004/2005
|
42nd, 2004
|
9th, 2005
|
20
|
35.4%
|
A/California/7/2004
|
3.7%
|
A/New Caledonia/20/99
|
60.9%
|
B/Shanghai/361/2002
|
2005/2006
|
6th, 2006
|
5th,2006
|
-1§
|
83.0%
|
A/Wisconsin/67/2005
|
16.1%
|
A/New Caledonia/20/99
|
0.9%
|
B/Malaysia/2506/2004
|
2006/2007
|
49th, 2006
|
11th, 2007
|
14
|
49.0%
|
A/Brisbane/10/2007
|
9.2%
| A/New Caledonia/20/99 ∣ A/Solomon Islands/3/2006 |
41.8%
|
B/Malaysia/2506/2004
|
2007/2008
|
39th, 2007
|
5th, 2008
|
18
|
5.4%
|
A/Brisbane/10/2007
|
93.0%
|
A/Solomon Islands/3/2006
|
1.6%
|
B/Florida/4/2006
|
2008/2009
|
44th, 2008
|
5th, 2009
|
13
|
28.1%
|
A/Brisbane/10/2007
|
61.8%
|
A/Solomon Islands/3/2006
|
10.1%
|
Brisbane/60/2008
|
- * The peak week of influenza cases.
- † See method section about a definition of “early phase”.
- ‡ Data not available.
- § Minus value of duration between means that peak week came earlier than the lowest WSD week.
- ∣ After A/New Caledonia/20/99 was circulated, A/Solomon Islands/3/2006 was equivalently circulated in 2006/2007 season.