Dr. Howard Smith Oncall

  Vidcast:  https://youtu.be/LzRnZvYkvbg   An excellent video from the Children’s Hospital of Philadephia and the University of Pennsylvania that demonstrates how viral vector vaccines such as the Johnson and Johnson-Janssen and the AstraZeneca-Oxford vaccines work to produce immunity against the CoVid19 virus.   https://vaccinemakers.org/resources/videos-animations   #CoVid #viralvector #vaccine #johnsonandjohnson #astrazeneca