Spring (Sp); Summer (S); Fall (F); Winter (W).
a No samples were collected from the Oldman or Bras d’Henri during spring of 2005.
b Samples were collected from the Grand watershed only.
c No samples were collected from the Sumas during this year.
d Among the top 13 disease-causing serovars in Canadians from 2005 to 2010 (NESP, 2010).
e Serovars detected only once throughout the entire study.