Delhi airport on Wednesday, amid a spurt in infections that is seen as the emergent second wave of the killer virus.Passengers who will be found Covid-19 positive at arrival will have to mandatorily quarantine, the Delhi Airport said in a statement.A notice shared on Twitter by the Delhi International Airport Limited or DIAL read: "As per the latest govt mandate, District Disaster Management Authorities shall conduct random COVID-19 testing of passengers coming from the states where the cases are increasing. (sic).""After collection of samples, the travellers would be allowed to exit," it said.