#TBT One year ago today, the #COVIDvaccine arrived at Penn Medicine to palpable feelings of hope and gratitude. Since then, we've vaccinated over 350,000 people against COVID-19. It's thanks to research conducted at Penn Medicine that these #mRNAvaccines were developed and those vaccinated are able to gather safely with loved ones this holiday season. We encourage everyone to #getvaccinated or #getboosted to protect yourself and others against this virus. Visit the 🔗 in our bio for more.