<span style="color: #222222;">In Tamil Nadu, the 'convalescent plasma therapy' trial in seven patients in Chennai has proved very effective, according to the state health minister Dr Vijayabhaskar.<br />'' <br />'' The therapy involves using the blood plasma drawn from discharged COVID-19 patients.<br />'' <br />'' He also told reporters in Chennai on Thursday, the 'solidarity trial' for Covid-19 treatment with the broad-spectrum anti-viral medicine remdesivir has also given promising results.<br />'' <br />'' Meanwhile, the tally of Covid-19 patients in Tamil Nadu has crossed 19 thousand and the number of patients in the state capital Chennai is close to the 13-thousand mark.<br />'' <br />'' The number of deaths due to Covid-19 has gone up to 145 in the state with 12 people succumbing to the disease on Thursday.<br />'' <br />'' Meanwhile, the southern railway continues to operate a series of Shramik special trains for migrant workers.<br />'' <br />'' AIR correspondent reports, the Southern Railways has transported more than 3 lakh guest workers in 240 Shramik Special trains in just 27 days since May 1st.<br />'' <br />'' They include 165 Special trains that originated from Tamil Nadu, 57 from Kerala, 17 from parts of Karnataka falling within the Southern Railway and one from Puducherry.<br />'' <br />'' Station-wise, Chennai Central, Coimbatore, Tiruppur and Tiruvallur in Tamil Nadu and Mangalore in Karnataka share the maximum Shramik Special Trains from the Southern Railway to originate the travel.<br />'' <br />'' The train destinations mostly included Bihar, Uttar Pradesh, Jharkhand, Odisha and West Bengal.<br />'' <br />'' The authorities from the state Governments concerned brought the passengers from different locations to the originating stations.<br />'' <br />'' The guidelines issued by Union Ministries of Home and Health and Family Welfare were duly enforced at railway stations.<br />'' <br />'' </span><br />