Table 3. Norovirus GII.4 variants in outbreaks during July 2000 to June 2008.
Observation Period | Jul00 to Jun01 | Jul01 to Jun02 | Jul02 to Jun03 | Jul03 to Jun04 | Jun04 to Jul05 | Jul05 to Jun06 | Jul06 to Jun07 | Jul07 to Jun08 |
Number of norovirus GII outbreaks by sequence | 21 | 3 | 75 | 13 | 158 | 55 | 259 | 93 |
Number of GII.4 variants outbreaks (%) | 18 (85.7) | 2 (66.7) | 71 (94.7) | 10 (76.9) | 148 (93.7) | 41 (74.5) | 252 (97.3) | 75 (80.6) |
GII.4-1996 | 18 | 2 | ||||||
GII.4-2002 | 2 | 61 | 8 | 5 | ||||
GII.4-2004 | 141 | 18 | ||||||
GII.4-2006a | 2 | 9 | 62 | 5 | ||||
GII.4-2006b | 12 | 189 | 61 | |||||
GII.4-2008a | 1 | |||||||
GII.4-2008b | 4 | |||||||
GII.4-other | 10 | 2 | 1 | 4 |