As COVID-19 cases rise, Tamil Nadu to fall back on proven strategies to prevent second wave In the past few weeks, Tamil Nadu has seen a gradual rise in the number of new cases as well as in the test positivity rate. Share Via Email | A+A A- A man poses after receiving a dose of Covid-19 coronavirus vaccine at a government hospital. (Photo| AFP) Express News Service CHENNAI: As Tamil Nadu stands at the precipice of an intensive poll campaign, Health officials have acknowledged a surge in Covid-19 cases and instructed local health workers to fall back on proven containment and surveillance strategies.