Among exchange-traded funds, the Nasdaq 100 tracker Invesco QQQ Trust (NASDAQ: QQQ) rallied 1.2% Tuesday, while the SPDR S&P 500 ETF (NYSEARCA:SPY) rose 1%. Investors also weighed in on the news of the White House stepping in to help fight the Omicron variant with the deployment of military personnel to hospitals. This could reflect a rebound from declines in the previous session ignited by renewed fears that swelling Omicron case numbers could worsen inflationary pressures and also hinder economic recovery.