All of these pandemics are man-made. Look at HIV. Was it just a coincidence that there was a lab in the same part of Africa where AIDS suddenly transferred from ape to man? A lab that was studying infectious diseases. Covid came from an area of China where a lab was studying infectious disease.
HIV was common in apes, but did not make them sick. Covid was common in animals but did not make them sick. Spanish flu was common in animals but did not make them sick. (it supposedly originated at a farm in Kansas where they were studying swine diseases)
Lyme disease originated near a lab studying infectious disease in Plum Island.