Deformed wings are a sign of a virus called, appropriately enough, Deformed Wing Virus.
The virus occurs just like head colds and the flu in humans. It is passed around in many ways, most notably via varroa mites.
So, the first thing I did was put a board under the hive for 24 hours to catch debris. As bees groom and eat, things fall to the bottom. In 24 hours, you pull the board and count the number of mites. That'll give you an idea of the mite load the hive has. If you count more than 60 mites in 24 hr period, then you need to treat the hive quickly. Those mites are spreading more than DWV.
After 24 hours I pulled the board and looked for mites. With my glasses on. With a magnifying glass. No mites.
That doesn't mean they don't have any; it just means that the mite load is small.
So, one case of DWV is not good, but it doesn't look like it's going to be catastrophically epidemic.
