** Shares of drugmaker BioCryst Pharmaceuticals BCRX.O fall 2% to $7.24
** BCRX on Monday filed lawsuit against Annora Pharma and other companies for patent infringement, according to SEC filing
** BCRX is seeking to stop the companies from making generic version of its rare genetic drug, Orladeyo, and delay U.S. FDA approval until patents expire
** Annora claims the three patents that expire in 2039 are invalid, unenforceable and/or won't be infringed by their generic product
** Annora did not immediately respond to Reuters' request for comment
** BCRX gained ~24% in 2024
(Reporting by Kamal Choudhury in Bengaluru)
((Kamal.Choudhury@thomsonreuters.com;))