Table 2.

Typed isolates by location and study year

Year	Nottingham	Hampshire	Total
May 2000–April 2001	316	276	592
May 2001–April 2002	292	262	554
May 2002–April 2003	188	112	300
Total	796	650	1446*

^*Cases reporting date of onset of illness. Of the 59 cases not recording onset date an estimated date based on laboratory data indicated onset of 17, 30 and 12 cases in years 1, 2 and 3, respectively.