** Shares of PharmAust PAA.AX rise as much as 29.7% to
A$0.240, their biggest intraday percentage gain since Feb 28
** Stock hits its highest level since May 1
** The clinical-stage biotech firm says it received orphan
drug designation from the U.S. Food and Drug Administration for
its motor neuron disease treatment drug monepantel
** Over 5.8 mln shares change hands, compared with the
30-day average volume of around 1.3 mln
** Stock up 60.9% YTD, based on last close
(Reporting by Aaditya Govind Rao in Bengaluru)
((Aaditya.govindrao@thomsonreuters.com;))