TABLE 1.

Percentages of infected honey bees in the different test groupsa

GroupTemp (°C)% of infected bees on p.i. day:
12347
N. apis-exposed bees253353100100100
336693100100100
37536060600
N. ceranae-exposed bees25100100100100100
33100100100100100
37100100100100100
Controls2500000
3300000
3700000
  • a A bee is considered to be infected when at least one spore is observed in the hemocytometer's entire central square millimeter grid (19).