* Senate may revise $1.9 trillion covid aid bill in days ahead
* Worrisome mutation of coronavirus spreading in New York, report finds
* Moderna set to test modified vaccine to treat coronavirus variant
* Fed’s Powell tells Congress central bank’s in no rush to raise rates
* Rising 10-year Treasury yield is headwind for risk assets
* Bull market is reversing two-decade slump in supply of new public companies
* Eurozone economic confidence improves on optimism for vaccine rollout
* Risk factors to watch for booming housing market
* New US home sales rose more than expected in January, near 13-year high: