I very recently had a problem.
Moved a log with a nest in it. Obviously I did not see a nest, I would never have moved it If I saw a nest. I dont know if they were Wasps or Bees.
They were very upset and chased me away. I took about 20 stings all on my head. The only part of me that was uncovered. It hurt a lot. It took nearly 5 weeks before the stings cleared up and there was no trace.