A pharmacist receives her first dose of the Pfizer COVID-19 vaccine in Miramar, Florida, on Dec. 14, 2020.
The United States and Europe will overcome the slow and problematic rollout of COVID vaccination campaigns in the coming months, but concerns about new strains of the virus will likely push governments to adjust protocols in order to speed up distribution. Changing the timing of doses, skipping a dose or combining vaccines are all high-risk endeavors in that they would disrupt data collection and analysis of vaccine efficacy in ongoing studies. But such vaccine protocol changes may nonetheless be deemed necessary to increase vaccination rates as policymakers scramble to quickly secure herd immunity and bring an end to the pandemic. Vaccination rates, however, will still likely hit a roadblock once skeptics from broader swaths of the population begin to defer immunization in successive vaccination waves. ...
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