What Is Vaccine Nationalism?

When a government of any country acquires doses through an arrangement with a manufacturer prioritizing its own people, then we call it as vaccine nationalism. A lot of rich countries acquire vaccines by signing three-purchase agreement for them with pharma companies. And that ends up having a bad effect or like a sort of a problem for the low-income countries to procure them. It's not like it's happened in COVID-19. It's happened before as well. So this is what is called a vaccine nationalism.