Why is PH contracting to buy AstraZeneca vaccine that still needs additional trials?

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I WRITE this out of sheer ci-tizen concern and journalistic curiosity. I do not represent a business or political interest that Secretary Carlito Galvez said he was told to shun when President Rodrigo Duterte designated him as the country’s “vaccine czar” to undertake the procurement, purchase and distribution of a Covid-19 vaccine to meet our people’s needs.