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Researchers urge delay in administering Pfizer vaccine's second dose, cite strong data

Vials labelled "COVID-19 Coronavirus Vaccine" and a syringe are seen in front of the Pfizer logo. [Reuters]

Researchers on Wednesday urged governments to delay administering the second dose of Pfizer Inc’s COVID-19 vaccine, which they said had an efficacy of 92.6% after the first dose.

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