USDA's Packers and Stockyards Division started investigation into potential market manipulation in beef packing industry in August 2019.
Vaccine from Harbin Veterinary Research Institute has been field tested on 3,000 hogs.
Beef and pork production dropped nearly 30% during April as COVID-19 sickened workers.
$7.6 billion deal announced in August 2019; expected to be completed by mid-year 2020.
More than 65 groups urge governments to reaffirm safety of food system in wake of global pandemic.
The Around Farm Progress podcast connects with editors in Kansas and Pennsylvania