| Number | Percent polyclonal (95% Confidence interval) | Percent genetic divergence (95% Confidence interval) |
---|---|---|---|
Passively detected cases | |||
 2012–2013 | 12 | 0 (0–26) | 35 (27–42) |
 2013–2014 | 25 | 12 (3–31) | 38 (34–42) |
 2014–2015 | 9 | 0 (0–34) | 31 (19–43) |
Actively detected cases | |||
 2008a | 15 | 87 (60–98) | 22 (17–28) |
 2008–2009 | 19 | 79 (54–94) | 29 (26–32) |
 2009–2010 | 13 | 69 (39–91) | 24 (20–28) |
 2010–2011 | 12 | 92 (62–100) | 15 (10–19) |
 2011–2012 | 7 | 86 (42–100) | 18 (11–26) |
 2012–2014 | 6 | 100 (54–100) | 10 (2–17) |