** Drug developer's ICVX.O shares plunge 20% to $9.99
before the bell; set to extend 45% YTD fall through Thursday
close
** Co says its COVID-19 vaccine candidate was immunogenic
but the level of response was below its expectations, according
to interim data from early-stage study urn:newsml:reuters.com:*:nGNX85Yh1B
** "We plan to investigate the potential causes of these
discordant clinical results, including manufacture, shipment,
and administration of the product" - CEO
** Says co remains on track for data from early-stage study
for lead program IVX-121 against respiratory syncytial virus in
Q2
** Stock now trading below its IPO price of $15 per share;
co sold roughly 12.13 mln shares in IPO, raising about $182 mln
last year urn:newsml:reuters.com:*:nL4N2P53LS
(Reporting by Ankur Banerjee)