Islamabad : Pakistan Society of Haematology president Dr Parvez Ahmed has warned that the unregulated use of blood plasma without optimal donor screening and patient selection can be harmful to coronavirus patients.Dr Parvez Ahmed, a professor of clinical haematology at the Quaid-e-Azam International Hospital, Islamabad told ‘The News’ that there was currently no approved treatment for COVID-19, so different investigational drugs were being used.“Convalescent plasma is one of the...