http://www.sciencemag.org/news/2020/06/swine-flu-strain-human-pandemic-potential-increasingly-found-chinese-pigs

Nasal swabs from more than 30,000 Chinese pigs over 7 years found an increase in an avianlike influenza virus that has swapped genes from several strains.

What the world doesn’t need now is a pandemic on top of a pandemic. So a new finding that Chinese pigs are more and more frequently becoming infected with a strain of influenza that has the potential to jump to humans has infectious disease researchers worldwide taking serious notice. Robert Webster, an influenza investigator who recently retired from St. Jude Children’s Research Hospital, says it’s a “guessing game” as to whether this strain will mutate to readily transmit between humans, which it has not done yet. “We just do not know a pandemic is going to occur until the damn thing occurs,” Webster says, noting that China has the largest pig population in the world. “Will this one do it? God knows.”