In a mass plasma donation drive by Surat city police, a total of 22 cops have agreed to donate plasma out of which 17 were shortlisted after antibody test. “Apart from preventing spread of the virus it (plasma donation) is an additional contribution by police to the society,” said Ajay Tomar, city police commissioner. Till date, 67 cops have tested positive for Covid-19, while one assistant sub-inspector has died of the virus infection.