Deal reached on massive US virus aid bill

The White House and Senate leaders of both parties have struck an agreement on a sweeping $US2 trillion ($A3.3 trillion) measure to aid workers, businesses and a healthcare system strained by the rapidly spreading coronavirus outbreak.

Top White House aide Eric Ueland announced the agreement in a Capitol hallway just after midnight on Wednesday.

The agreement came after days of often intense haggling and mounting pressure and still needs to be finalised in detailed legislative language.

The unprecedented economic rescue package would give direct payments to most Americans, expand unemployment benefits and provide a $US367 billion program for small businesses to keep making payroll while workers are forced to stay home.

One of the last issues to close concerned $US500 billion for guaranteed, subsidised loans to larger industries, including a fight over how generous to be with the airlines.

Hospitals would get significant help as well.