The Centre on Saturday raised concern over a sharp increase in daily cases of Covid-19 and rising mortality rates, particularly in five states of Odisha, Karnataka, Kerala, Tamil Nadu and Mizoram and the Union Territory of Jammu & Kashmir, an alert heightened by the emergence of the Omicron variant.The Centre on Saturday raised concern over a sharp increase in daily cases of Covid-19 and rising mortality rates, particularly in five states of Odisha, Karnataka, Kerala, Tamil Nadu and Mizoram and the Union Territory of Jammu & Kashmir, an alert heightened by the emergence of the Omicron variant.