Summary:
Chennai: Tamilnadu Health Secretary Dr J Radhakrishnan has said Covid-19 clusters are originating from markets crowded places and on occasion even visits to hospitals. Amid slight rise in coronavirus cases in the State he has directed officials that localised mini-containment measures were important when there were more than three Covid-19 cases in a locality and that contact tracing should be done effectively. He added: “After the relaxation of restrictions such gradual increases are expected. The third cross-sectional serosurvey conducted between June and July covering 26610 samples revealed nearly double the seropositivity compared to the rate prevailing at the end of the first wave in October 2020. The increase was because either more people were infected or more had got vaccine shots officials said..