By Prudence Ho LONDON (LPC) - Some 40% of European corporate high-yield bond and leveraged loan issuers have low leverage headroom and could struggle to cope with the downturn caused by the coronavirus, Fitch Ratings said in a recent report. Prior to the virus outbreak, leverage ratios, or debt-to-Ebitda, on these credits was already high for their ratings, Fitch said after screening a total of 454 issuers.