COVID-19 and big pharma: what are 15 leading companies doing to develop a coronavirus vaccine? https://t.co/b1N4V2FTG8 #COVID-19 #vaccines $PFE $GOVX $BNTX $GSK $INO $JNJ $NVAX $EBS $SNY $HTBX @BARDA @WHO @AllianceCBRN $VIR $WXXWY $MRNA @CEPIvaccines https://t.co/es013Zrq0k