Iranians mark birth anniversary of Hazrat Zeinab (AS), sister of the third Shia Imam and granddaughter of Prophet Mohammad (PBUH) known as National Nurses Day. The occasion is particularly significant due to the struggles of the healthcare workers and medical teams against the new coronavirus over the past year. Supreme Leader of Islamic Revolution Ayatollah Khamenei in a live speech today marked the occasion calling the nurses as "angels of mercy for patients."