The only way to end the COVID-19 pandemic is to immunize enough people worldwide. The slogan “no one is safe until we are all safe” captures the epidemiological reality we face. Outbreaks anywhere could spawn a SARS-CoV-2 variant that is resistant to vaccines, forcing us all back into some form of lockdown. Given the emergence of worrisome new mutations in India, Brazil, South Africa, the United Kingdom, and elsewhere, this is no mere theoretical threat.
Worse, vaccine production is currently nowhere close to delivering the 10-15 billion doses needed to stop the spread of the virus. By the end of April, only 1.2 billion doses had been produced worldwide. At this rate, hundreds of millions of people in developing countries will remain unimmunized at least until 2023.