Are we going to waste three quarters of our vaccine supply?
“A Better Way to End the Pandemic Quickly” (MedPage Today):
The current plan is to give two doses, 21 days apart for the Pfizer product and 30 days apart for Moderna’s. Alternatively, all available doses could be given immediately, doubling the number of people who could be reached. Both Pfizer and Moderna report that the efficacy of a single dose is only about 50%. But a closer look at their incidence curves suggests that immunity appears to be maximized about 14 days after the first dose. In the Moderna trial, for example, most of the cases in the vaccine arm occurred during the first 2 weeks following the initial dose. We recognize that the vaccine was developed and tested on the assumption that two doses are necessary. Yet, the trial data suggest that a single dose provides substantial immunity. During this severe pandemic, it seems reasonable to use the available supply to reach as many people as possible in the short term. Delaying the second dose would maximize limited resources and could reduce serious illness and death. A recent projection suggests the U.S. will receive 40 million doses of the two mRNA vaccines by early 2021. A rough calculation suggests that vaccinating 40 million persons with these 40 million doses versus 20 million persons with two doses each could prevent over 100,000 severe cases and save over 10,000 lives.
Despite that fact that the Moderna vaccine was developed nearly a year ago (see “We Had the Vaccine the Whole Time”), testing has been so slow that we can suspect, but don’t know for sure, that one dose is sufficient!
If the MedPage Today authors (Michael H. Criqui, MD, MPH, and Robert M. Kaplan, PhD; maybe they are colleagues of Dr. Jill Biden, MD?) are correct, we are going to be wasting half of our vaccine supply by giving two doses when one is sufficient.
How might we waste half of the remaining half? By giving the vaccine to people who are already immune as a result of previous infection (nearly one third of the U.S. population had been infected as of November (NPR/CDC), which means it will be closer to 165 million by the time the vaccine is available to the average person).
[In the Department of Prescience: “Up to 150 million Americans are expected to contract the coronavirus, congressional doctor says” (March 11, 2020).]
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