From the government's reaction to a vaccine trial participant's allegations, to Uttar Pradesh joining the list of states capping RT-PCR test prices - here are the top news updates on the Covid-19 pandemic. A candidate in the vaccine trials being conducted by Serum Institute of India alleged serious side-effects. The company rejected the allegations that the vaccine was the cause. When asked about the row, the government said that adverse events during the trials won't affect the vaccine timeline. After Delhi and Gujarat, Uttar Pradesh fixed the maximum price of RT-PCR tests. In international news, a top US official said that two vaccines may be available by Christmas. US authorities may give emergency use authorisation to Pfizer and Moderna vaccines. Watch the full video for the other updates on the spread of the Sars-CoV-2 coronavirus.