A new form of African swine fever identified in Chinese pig farms is most likely caused by illicit vaccines.
https://www.reuters.com/articl....e/us-china-swinefeve

New China swine fever strains point to unlicensed vaccines | Reuters

A new form of African swine fever identified in Chinese pig farms is most likely caused by illicit vaccines, industry insiders say, a fresh blow to the world's largest pork producer, still recovering from a devastating epidemic of the virus.