Table 1.
Prevalence of colonies infected with N. apis only (N. apis) or N. ceranae only (N. ceranae) or with N. apis and N. ceranae (co-infection) from spring 2005 to autumn 2016.
| Total number of analyzed colonies | Infected Colonies [infection categories] | |||||||
|---|---|---|---|---|---|---|---|---|
| N. apis | N. ceranae | co-infection | ||||||
| n | % | n | % | n | % | |||
| Spring | 2005 | 220 | 37 | 16.8 | 9 | 4.1 | 6 | 2.7 |
| Autumn | 2005 | 237 | 19 | 8.0 | 10 | 4.2 | 1 | 0.4 |
| Spring | 2006 | 238 | 43 | 18.1 | 10 | 4.2 | 14 | 5.9 |
| Autumn | 2006 | 226 | 15 | 6.6 | 3 | 1.3 | 2 | 0.9 |
| Spring | 2007 | 228 | 7 | 3.1 | 34 | 14.9 | 10 | 4.4 |
| Autumn | 2007 | 219 | 10 | 4.6 | 4 | 1.8 | 1 | 0.5 |
| Spring | 2008 | 209 | 35 | 16.8 | 18 | 8.6 | 21 | 10.1 |
| Autumn | 2008 | 210 | 6 | 2.9 | 5 | 2.4 | 0 | 0.0 |
| Spring | 2009 | 210 | 33 | 15.7 | 23 | 11.0 | 12 | 5.7 |
| Autumn | 2009 | 180 | 9 | 5.0 | 7 | 3.9 | 0 | 0.0 |
| Spring | 2010 | 247 | 27 | 10.9 | 25 | 10.1 | 4 | 1.6 |
| Autumn | 2010 | 250 | 10 | 4.0 | 16 | 6.4 | 0 | 0.0 |
| Spring | 2011 | 230 | 42 | 18.3 | 25 | 10.9 | 16 | 7.0 |
| Autumn | 2011 | 255 | 7 | 2.8 | 7 | 2.8 | 5 | 2.0 |
| Spring | 2012 | 252 | 24 | 9.5 | 33 | 13.1 | 23 | 9.1 |
| Autumn | 2012 | 278 | 6 | 2.2 | 19 | 6.8 | 0 | 0.0 |
| Spring | 2013 | 233 | 15 | 6.4 | 30 | 12.9 | 12 | 5.2 |
| Autumn | 2013 | 257 | 17 | 6.6 | 21 | 8.2 | 4 | 1.6 |
| Spring | 2014 | 224 | 41 | 18.3 | 33 | 14.7 | 7 | 3.1 |
| Autumn | 2014 | 261 | 4 | 1.5 | 8 | 3.1 | 0 | 0.0 |
| Spring | 2015 | 198 | 25 | 12.6 | 15 | 7.6 | 7 | 3.5 |
| Autumn | 2015 | 250 | 5 | 2.0 | 3 | 1.2 | 0 | 0.0 |
| Spring | 2016 | 230 | 43 | 18.7 | 21 | 9.1 | 4 | 1.7 |
| Autumn | 2016 | 258 | 8 | 3.1 | 27 | 10.5 | 0 | 0.0 |
Given are the total number of analyzed colonies per year and season as well as the numbers (n) and proportions (%) of colonies within each infection category.