** Bluejay Diagnostics' BJDX.O shares more than double to $4.72 in premarket trading
** Co says it has expanded its partnership with Japan's SanyoSeiko to help commercialize its new Symphony rapid testing platform for management of sepsis
** Sepsis is a life-threatening condition caused by the body's response to infection, according to NIH
** BJDX's Symphony platform aims to deliver results for IL-6, a protein tied to inflammation in sepsis, in about 20 minutes
** Symphony is still awaiting U.S. FDA clearance, co says
** Up to last close, stock down ~62% YTD
(Reporting by Sahil Pandey in Bengaluru)
((Sahil.Pandey@thomsonreuters.com;))