Scientists working on a mathematical model to examine the Covid-19 spread forecast that the current second wave will peak somewhere between April 15-20 and the number of ‘active’ symptomatic cases would hit a high roughly a week later at the same level of around 10 lakh cases the country had seen in September last year.Scientists working on a mathematical model to examine the Covid-19 spread forecast that the current second wave will peak somewhere between April 15-20 and the number of ‘active’ symptomatic cases would hit a high roughly a week later at the same level of around 10 lakh cases the country had seen in September last year.