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U.S. investigates possible COVID-19 vaccine links to deaths amid safety review.
The U.S. is investigating a number of deaths potentially linked to COVID-19 vaccines, as health officials adjust monitoring policies.
The probe comes amid a broader review of vaccine safety protocols, though no definitive connection has been established.
Authorities are reviewing reports through established surveillance systems to assess any possible risks.
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Estados Unidos investiga posibles vínculos de la vacuna COVID-19 con muertes en medio de una revisión de seguridad.