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Currently, Moderna and Pfizer are some of the vaccines that are being used for vaccination against the Covid-19 virus following emergency FDA authorization. As of 05/2021, people across the world are being vaccinated with one of either vaccine. Using at least 1 credible source and citing it properly, explain how the vaccine (choose Moderna or Pfizer) works, and its pros and cons. Also, how does it differ from the one-shot vaccines? What are some other applications for this technology (mRNA vaccines) beyond vaccinations? Viruses are known to mutate. As of 05/2021, there is so much news on the increasing incidence of the new strain of COVID-19 virus. How and why do viruses mutate. How does the new strain/variant of COVID-19 (B.1.427, B.1.429, B.1.351, B.1.1.7 there are several strains based on location, pick one) differ from the original COVID-19 virus (think genetic make, the severity of symptoms, transmission, etc)? Did this or will this affect the vaccine already in use? If yes, why, and if no, why. Provide evidence for your argument. Cite all sources