PDS Bio leads - up 7.5% while Immunity Bio gives up 13% - overall average was down 1.5%

Fairly positive-looking day turns south in the afternoon. The overall average was a loss of 1.5% with 19 stocks falling and eight gaining ground.

PDS Bio lead to the upside with a strong 7.5% gain. All three large vaccine producers, Moderna, Novavax and BioNTech all had gains.

Immunity Bio had the steepest loss, falling over 13%. Arcturus gave back 6%, while Sorrento and Altimmune fell 5%.