Is this disease a natural disaster or a man-made disaster?

The boundary between natural disasters and man-made disasters is clear, but the actual situation is different. For example, viruses unique to nature are prevalent among animals, which can be called natural disasters, but human beings intentionally flow into the market, which is man-made disasters. Let's start with novel coronavirus in 2020. Was it brought into the market intentionally or unintentionally? Did you pass the inspection? To sum up, the plague in 2020 began with man-made disasters.