Fitch affirms U.S. rating amid coronavirus outbreak, warns of credit risks

(Reuters) - Fitch Ratings on Thursday affirmed the United States' credit rating at AAA with a stable outlook, but warned that even before the massive economic shocks caused by the spreading coronavirus, the nation's already high and rising debt and deficits were starting to erode its credit strengths.Big swaths of the U.S. economy have shuttered as state and local governments ordered people to shelter in their homes to stop the virus' spread. Meanwhile, the U.S. Congress has taken up a $2..