Just a note to say that the University of Minnesota is working on a
line of bees that are very hygienic or should I say cleans house very well.
These bees throw out sick bees, throw out things that might harm the hive.
I don't know if you can just "TEST" these bees for resistance because it is
a behavior...It's like saying people who take out  there garbage every day
have less flies (Disease) in there house than people who take it out only
once a month.  How could you "TEST" these people for disease resistance?