 Mass testing revealed an outbreak of novel coronavirus infections at plants operated by JBS SA and BRF SA in Brazils Center West, the labor prosecutors office in Mato Grosso do Sul state said on Friday, citing company data. JBS tested 4,134 employees, with 2,518 people showing negative results and 541 results pending. It employs about 4,300 persons in Dourados, which is epicenter of the coronavirus in Mato Grosso do Sul. 