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© Provided by Xinhua We have achieved exemplary large-scale epidemiological laboratory work to demonstrate how the effectiveness of the vaccine can sav

Sao pauloRibeirao pretoJoao doriaDimas covasSinovac coronavacRicardo palaciosButantan instituteUniversity of sao pauloSao paulo stateSao paulo state governor joao doriaButantan instituteNow theChieved exemplarySecond waveஸ்ம் பாலொரிபேறோ பிரெதோ