The Brihanmumbai MunicipalCorporation on Friday directed dialysis centres in the metropolis to screen persons for coronavirus symptoms before treating them.The directive asked centres to create exclusive dialysis facility for COVID-19 patients or send them to Kasturba, KEM, Nanavati, Seven Hills and Saifee Hospitals."It has been observed that few centres are doing dialysis of COVID-19 symptomatic patients, thereby spreading the disease," it said, adding that those violating this directive would be penalised.