[Ainda não publicado] Estudo feito em Israel mostra que reforço com 4ª dose de vacina contra COVID tem eficácia limitada.

Israel Finds Fourth COVID Booster is Ineffective, While Hospitalised Omicron Patients Fare Much Better Than Delta Patients – Health Policy Watch

Ver também:

Israeli trial, world’s first, finds 4th dose ‘not good enough’ against Omicron – The Times of Israel

Israel study: 4th vaccine shows limited results with omicron – MedicalXpress