Plasma therapy for coronavirus is still in an experimental stage and can even prove "life threatening" for a patient, the government said today amid a surge of hope brought in by the first successful test in Delhi. There is "no concrete evidence to support plasma therapy as coronavirus treatment," senior health ministry official said today during the ministry's daily briefing. "The therapy is still in an experimental stage and the Indian Council of Medical Research is conducting a national study on it. It can even be life threatening, he added.