#VaccineDevelopmentStrategies

[elainaledoyen]

Vaccine development is protracted and risky. On average, vaccines take more than 10 years to move from the preclinical phase to approval, and the probability of market entry for any given candidate has been just 6%. With 140 COVID-19 vaccines currently in development, 13 of which are already in human trials, it is extremely likely then that multiple candidates will eventually be approved, but the question is, how long will this take? Four basic vaccine strategies are being employed across these 140. Each approach has its strengths and weaknesses to activate the immune response to attack the SARS-CoV-2 virus when presented.