All of my six honey bee colonies made it through the winter this year. I'm sure the mild winter helped. They have been very active for a few of weeks and just yesterday I removed the candyboards (winter feeders) and added empty medium supers to all. I think this is earliest I have ever added the supers. I'll be putting out my swarm traps pretty soon.
I tested all of my colonies for mites last year and with life-cycle-interruption techniques I was able to greatly reduce the mite count in four of the hives but I had to resort to chemicals in two hives.
As soon as the weather gets more predictable I'll do some Nosema testing. Nosema is the scary one - a deadly fungus that is, to date, incurable. The poor honey bees are under attack from something 24/7/365. Wax moths, small hive beetles, mites, several viruses, pesticides, and now two kinds of Nosema. Whew!