Uttar Pradesh on Thursday reported 341 new Covid-19 cases, recording the highest single-day spike so far. The state now has 5,515 infections. As many 138 persons have succumbed to the dreaded virus till now. Majority of the new patients were migrant workers who had recently returned from Maharashtra. Meanwhile, Barabanki district has emerged as the new Covid-19 hotspot. 95 new cases of the virus were reported in a single day, half of them migrant workers returning from other states.