A fast spreading coronavirus outbreak could knock $211 billion off the combined economies of the Asia-Pacific, with Japan, Hong Kong, Singapore and Australia among the most exposed, S&P Global Ratings said on Friday. S&P cut its 2020 growth forecast for China to 4.8% from previous estimate of 5.7%. It forecast Australian growth to slow sharply to 1.2% from an already below-trend 2.2% in 2019.