India reports 412 new Covid-19 cases, bringing total active cases to 4,170; Karnataka records three deaths, increasing national death toll to 5,33,337; country's case count now at 4,50,09,660; recovery rate at 98.81%, case fatality rate at 1.19%; 220.67 crore doses of Covid vaccines administered; six new cases of JN.1 sub-variant detected, total infections now 69; Dr V K Paul emphasizes importance of enhanced testing and surveillance; Union Health Secretary Sudhansh Pant urges compliance with surveillance guidelines; Kerala reports no new cases, active cases reduced to 3,096; total fatalities in Kerala at 72,064; Health Minister Veena George assures state's preparedness.