** Shares of Mesoblast MSB.AX rise as much as 46% to
A$2.890, their highest since Dec. 16, 2020
** Stock posts its biggest intraday percentage rise since
April 2
** Drug developer says U.S. Food and Drug Administration
approved co's cell therapy for graft-versus-host disease
** About 28.1 mln shares change hands, compared with the
30-day average volume of around 6.3 mln
** Stock up over 825% YTD, including session's move
(Reporting by Aaditya Govind Rao in Bengaluru)
((Aaditya.govindrao@thomsonreuters.com;))