Journal
NPJ VACCINES
Volume 5, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41541-020-0193-6
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Funding
- Bill & Melinda Gates Foundation, Seattle, WA [OPP1180199]
- Bill and Melinda Gates Foundation [OPP1180199] Funding Source: Bill and Melinda Gates Foundation
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Vaccines for 17 viral pathogens have been licensed for use in humans. Previously, two critical biological parameters of the pathogen and the host-pathogen interaction-incubation period and broadly protective, relative immunogenicity-were proposed to account for much of the past successes in vaccine development, and to be useful in estimating the certainty of success of developing an effective vaccine for viral pathogens for which a vaccine currently does not exist. In considering the certainty of success in development of human coronavirus vaccines, particularly SARS-CoV-2, a third, related critical parameter is proposed-infectious inoculum intensity, at an individual-level, and force of infection, at a population-level. Reducing the infectious inoculum intensity (and force of infection, at a population-level) is predicted to lengthen the incubation period, which in turn is predicted to reduce the severity of illness, and increase the opportunity for an anamnestic response upon exposure to the circulating virus. Similarly, successfully implementing individual- and population-based behaviors that reduce the infectious inoculum intensity and force of infection, respectively, while testing and deploying COVID-19 vaccines is predicted to increase the certainty of success of demonstrating vaccine efficacy and controlling SARS-CoV-2 infection, disease, death, and the pandemic itself.
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