A health worker fills up a syringe with a vaccines dose against COVID-19 as people queue at the Kya Sands informal settlement to be vaccinated by the Witkoppen clinic in Johannesburg on December 8, 2021. - Anti-Covid vaccines may lose effectiveness against Omicron, but one more dose could remedy this. Initial elements, notably given by the Pfizer laboratory, shed light on the capacity of the new variant to resist vaccination. Omicron is "probably not sufficiently neutralized after two doses", admitted Wednesday the groups Pfizer and BioNTech, whose anti-Covid vaccine is given in two injections. (Photo by EMMANUEL CROSET / AFP)
Un sanitario prepara una vacuna, en Johannesburgo. AFP

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