The letters in the newspaper blur, the traffic light is just an unclear spot of light – but after a few days the ghost is over again. Few people suspect that such a hint of shortsightedness can be the unexpected result of spring cleaning. Because when the attic is cleared out or the garden house is made ready for spring, you sometimes come across the remains of animal residents, which can be not only pleasant but also dangerous. This also applies to the tracks of the bank vole. She is a carrier of the hantavirus, more precisely a subtype called the Puumala virus, which can also make humans sick.