What are the ethical obligations of advanced countries to deal with COVID-19 in less developed countries?

What are the ethical obligations of advanced countries to deal with COVID-19 in less developed countries?

Do huge vaccine makers (eg, Pfizer, Johnson&Johnson, etc.) have a moral obligation to produce enough free vaccine to vaccinate the poor in Africa and other areas?

Or should wealthy countries just worry about vaccinating their own populations (only two thirds of Americans are currently vaccinated)?

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