NEW DELHI : The US on Sunday said it would remove bottlenecks in the export of raw materials essential for the production of vaccines in India on a day the UK announced that it was rushing ventilators and other critical equipment to help cope with an unprecedented surge in covid-19 infections in the country.Other countries too mobilized support help a beleaguered India fight a ferocious second wave of covid-19 infections that has brought the health infrastructure to breaking point in many parts of the country.On Sunday, US National Security Advisor Jake Sullivan spoke to his Indian counterpart Ajit Doval and conveyed that “the US has identified sources of specific raw material urgently required for Indian manufacture of the Covishield.