Spanish carmaker Seat has announced it will restart production gradually from April 27 after agreeing testing procedures on employees with union representatives. Seat aims to use polymerase chain reaction (PCR) testing on its employees to screen for the coronavirus. PCR tests, which are conducted using a nasopharyngeal swab to directly detect the presence of an antigen (molecules capable of stimulating an immune response), are the most reliable way to identify whether the person screened has contracted the Covid-19 virus, according to Seat, which said it is the first carmaker in Spain to carry out the testing.