The Southeast Asian nation, which is battling elevated inflation, took into consideration the increase in global rice prices and uncertainties in local rice supply, the president's office said in a statement.
The Philippines' paddy rice output rose 2.6% to a record 19.3 million tonnes last year, government data showed. The agriculture ministry targets unmilled rice output at 20.5 million tonnes this year.
Officials said Duterte was given the vaccine made by China's Sinopharm -- the same one secretly administered to members of his security team last year before any shot had been given regulatory approval.
"He was vaccinated not only to protect his health from Covid-19 but also to encourage our citizens to get vaccinated," Senator Christopher "Bong" Go posted.