** Shares of drug developer Axcella Health Inc AXLA.O
surge ~63% to 69 cents after the bell, top gainer across U.S.
exchanges
** Says submitted application to FDA to conduct mid-to-late
stage human trial of its long COVID fatigue treatment AXA1125
** Adds received regulatory guidance from U.K.'s MHRA that
aligns on key measurements for a registration trial, including
primary goal and trial design elements
** The submission is supported by results from a mid-stage
study evaluating the efficacy and safety of AXA1125 in patients
with fatigue related to long COVID
** Co lost ~84% last year
(Reporting by Sriparna Roy)
((Sriparna.Roy@thomsonreuters.com;))