Argentina threatens to cancel deal for Sputnik vaccine as Russia fails to deliver

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3. True - although Argentina has had three major suppliers (not just Sputnik):

Of the 40.7 million doses received so far, 13.7 m have been Sinopharm (not Sinovac - the less effective one Brazil, Chile, and Uruguay have been relying on); 11.9 m, Sputnik; 11.7 m, AstraZeneca; and 3.5 m, Moderna (with Pfizer on its way).

Their goal is 63 million, so they still have a ways to go.

Sputnik was the first in Argentina, due to Trump's export ban (and Pfizer's sovereign asset collateral demands) - but has since been eclipsed by these others.

As you pointed out, it also has that problematic 2nd dose - though numerous countries that have received Pfizer have likewise had to combine it with a different 2nd dose for the same reason: availability.

Excluding major vaccine producers (and those who got preferential treatment from Trump very early on - i.e. Israel and the UAE), most countries have faced that same bottleneck.

Thanks for your insightful and informed reply, Eugene (as always). Good chatting again.