Covid update: Donald Trump tests positive; Mumbai slums infection; Kerala cases

From US President testing positive to Kerala imposing Section 144, here are the top updates on coronavirus. US President Donald Trump and First Lady Melania Trump tested positive for coronavirus on Friday. US Vice President Mike Pence and Democratic Presidential candidate Joe Biden tested negative for Covid-19. Meanwhile, high fever, body ache and headaches were among some symptoms observed in several human trial participants of Moderna and Pfizer. Experts say that there is no need to raise an alarm as these are commonly observed symptoms. A recent study suggested that successful Covid-19 vaccine may not be enough. The study suggested that there is a need to overcome challenges in developing , evaluating, manufacturing and distributing the vaccine. Over 200 vaccine candidates are currently in development at different clinical trial stages globally. Watch the full video for more details.