According to ABC Australia:
“Mr Quilty said there were three known strains of African swine fever, two of which were understood to have emerged from illegal vaccines, and that there were no signs of countries being able slow the spread.
He said China’s push towards building super complexes – or so-called pig hotels – was also understood to have been impacted.”
(from March)
https://www.abc.net.au/news/2021-03-04/african-swine-fever-second-wave-hits-pigs-in-china/13208048
(as an aside, note that China -insists- on calling the swine flu ‘african’ swine flu, but bucked like a bronco over CCPVirus being called Wuhan Flu.)
China can’t feed its self!