NEW DELHI: India is to receive assistance from more than 40 countries, mainly oxygen-related equipment and key drugs, to fight an “unprecedented second wave" of covid-19 infections that has overwhelmed the country’s health infrastructure.Indian foreign secretary Harsh Vardhan Shringla said this as two flights brought in 20 oxygen production plants, ventilators and Favipiravir, used to treat covid-19 patients.Three special flights were expected from the US – two on Friday and one on Monday – with raw materials for the production of covid-19 vaccines, oxygen generating equipment and oxygen concentrators.Earlier on Thursday, a White House statement said the first tranche of assistance included ingredients to manufacture over 20 million doses.