<p>As Kerala battles a surge in Covid-19 cases <a href="https://www.deccanherald.com/national/south/delta-variant-of-covid-19-dominating-in-kerala-1014412.html" target="_blank">driven by the delta variant</a> logging over 22,000 daily infections for the better part of a week, neighbours Karnataka and Tamil Nadu also recorded a rise in cases after nearly three weeks and over two months respectively on Thursday.</p>.<p>Triggering fears of the possible onset of a third wave, Karnataka saw a rise in cases after 19 days from 1,531 on Wednesday to 2,052 on Thursday. Meanwhile, Tamil Nadu saw its daily Covid-19 cases rise from 1,56 to 1,859, registering a spike after 69 days. Daily Covid-19 death toll in Karnataka fell below 20 for the first time in three months.</p>.<p>Correspondingly, single-day Covid-19 cases across India also saw an uptick — with Kerala accounting for over half the cases — on Thursday and Friday. The number of cases on Thursday (43,509) was the highest since July 7. On Friday, the cases further rose to 44,230.</p>.<p><strong><a href="https://www.deccanherald.com/science-and-environment/explained-what-is-seroprevalance-and-what-does-it-tell-us-1014497.html" target="_blank">Explained | What is seroprevalance and what does it tell us?</a></strong></p>.<p>Unlike Kerala, however, where only 44 per cent of the population was exposed to the coronavirus, Karnataka and Tamil Nadu's population had a seroprevalance of 69.2 and 69.8 per cent respectively — higher than the national average of 67.6 per cent.</p>.<p>On Thursday, Kerala announced a complete lockdown on July 31 and August 1 as cases continued to rise. Many parts of the state were already under lockdown-like curbs. The state's test positivity rate currently stands at 13.53 per cent. The Centre even sent a <a href="https://www.deccanherald.com/national/south/central-team-to-visit-kerala-as-daily-covid-19-cases-remain-high-1014126.html" target="_blank">six-member delegation</a> to aid the state in managing the Covid-19 situation.</p>
<p>As Kerala battles a surge in Covid-19 cases <a href="https://www.deccanherald.com/national/south/delta-variant-of-covid-19-dominating-in-kerala-1014412.html" target="_blank">driven by the delta variant</a> logging over 22,000 daily infections for the better part of a week, neighbours Karnataka and Tamil Nadu also recorded a rise in cases after nearly three weeks and over two months respectively on Thursday.</p>.<p>Triggering fears of the possible onset of a third wave, Karnataka saw a rise in cases after 19 days from 1,531 on Wednesday to 2,052 on Thursday. Meanwhile, Tamil Nadu saw its daily Covid-19 cases rise from 1,56 to 1,859, registering a spike after 69 days. Daily Covid-19 death toll in Karnataka fell below 20 for the first time in three months.</p>.<p>Correspondingly, single-day Covid-19 cases across India also saw an uptick — with Kerala accounting for over half the cases — on Thursday and Friday. The number of cases on Thursday (43,509) was the highest since July 7. On Friday, the cases further rose to 44,230.</p>.<p><strong><a href="https://www.deccanherald.com/science-and-environment/explained-what-is-seroprevalance-and-what-does-it-tell-us-1014497.html" target="_blank">Explained | What is seroprevalance and what does it tell us?</a></strong></p>.<p>Unlike Kerala, however, where only 44 per cent of the population was exposed to the coronavirus, Karnataka and Tamil Nadu's population had a seroprevalance of 69.2 and 69.8 per cent respectively — higher than the national average of 67.6 per cent.</p>.<p>On Thursday, Kerala announced a complete lockdown on July 31 and August 1 as cases continued to rise. Many parts of the state were already under lockdown-like curbs. The state's test positivity rate currently stands at 13.53 per cent. The Centre even sent a <a href="https://www.deccanherald.com/national/south/central-team-to-visit-kerala-as-daily-covid-19-cases-remain-high-1014126.html" target="_blank">six-member delegation</a> to aid the state in managing the Covid-19 situation.</p>