수년간 심각한 문제로 떠올랐는데요 80년대 후반에 바로아 응애(진드기 일종)가 각종 바이러스와 박테리아와 진균성 질병을 들여왔거든요
Now this has been a huge problem for many years, basically since the late 1980s, when the varroa mite came and brought many different viruses, bacteria and fungal diseases with it.