Ten states are seeing an upsurge in Covid cases, the government said today, stressing on the need of strict restrictions in districts witnessing a positivity rate of more than 10 per cent. Apart from focusing on strict containment measures, states were also told today to "ramp up vaccination in the 60+ and 45-60 age categories as evidence shows near 80 per cent of the mortality is from these vulnerable age-group." The centre's fresh review comes amid concern over a third Covid wave.