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COVID-19 Variants Make Road to Normal a Bit Rocky.  
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1. Interim Estimates of Vaccine Effectiveness of BNT162b2 and mRNA-1273 COVID-19 Vaccines in Preventing SARS-CoV-2 Infection Among Health Care Personnel, First Responders, and Other Essential and Frontline Workers — Eight U.S. Locations, December 2020–March 2021 mmwr Weekly / April 2, 2021 / 70(13);495–500
2. Hansen CH, Michlmayr D, Gubbels SM, et al. Assessment of protection against reinfection with SARS-CoV-2 among 4 million PCR-tested individuals in Denmark in 2020: a population-level observational study. The Lancet. Volume 397, ISSUE 10280, P1204-1212, March 27, 2021
3. Hart R. Pfizer Says Its Covid-19 Vaccine Is 100% Effective In Young Teens. Forbes. Mar. 31, 2021.
4. Dr. Fauci: We don't want to declare victory against the virus prematurely. NBCUniversal. Apr. 6, 2021.
5. Marchione M. New variants raise worry about COVID-19 virus reinfections. Associated Press. Feb. 6, 2021.
6. BlazeTV. Senate Hearing. Marc. 18, 2021.
7. Sabino EC, Buss LF, Carvalho MPS, et al. Resurgence of COVID-19 in Manaus, Brazil, despite high seroprevalence. The Lancet. Feb. 6, 2021.
8. Choi J. First case of India's 'double mutant' COVID-19 variant found in San Francisco Bay Area The Hill. Apr. 5, 2021.
9. Hicks M. 246 vaccinated residents diagnosed with COVID; 3 dead, Michigan reports. Detroit News. Apr. 5, 2021.
10. Michigan’s second case of new COVID-19 variant discovered in Genesee County. MLive Michigan. April 7, 2021.
11. Factbox: Johnson & Johnson's COVID-19 vaccine recommended for EU authorization. Reuters News Service. Mar. 11, 2021.
12. Boyd C. South African Covid variant makes current crop of vaccines 30% less effective, SAGE warns. Daily Mail. Mar. 26, 2021.
13. Edara VV, Hudson WH, Xie X. Neutralizing Antibodies Against SARS-CoV-2 Variants After Infection and Vaccination JAMA Network. Mar. 19, 2021.