At Keyhung tea estate in Assam's Tinsukia district, Manju Tanti, a 47-year-old worker, sings to herself to keep her spirits high as she goes about plucking tea leaves. It's the crucial plucking season for Assam tea and the estates are operating despite strict restrictions in the state. But Manju, who is a mother of two young children, is worried. As many as 30 of her coworkers have tested positive for Covid in the last few days.