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Both doses key to combat severe symptoms – nation.lk – The Nation Newspaper

All vaccines have reduced efficacy against Delta variant   Immune response studies on Pfizer vaccines yet to commence  Single…

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All vaccines have reduced efficacy against Delta variant  Immune response studies on Pfizer vaccines yet to commence Single dose of any vaccine likely to be less effective  Single dose of AstraZeneca or Pfizer gives low protection  By Yumiko Perera 
Since…

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