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Health officials said first-generation vaccines also protect against COVID-19 from strains of the virus that are emerging in different parts of the world, but manufacturers are beginning to prepare for the case of a mutation that is more resistant to vaccines.
Pfizer said it would offer a third dose of the vaccine to 144 volunteers who participated in the first trials of the vaccine in the United States last year. The company wants to determine whether an additional dose of the vaccine, given 6 to 12 months after the first two doses, strengthens the immune system enough to repel mutated viruses.
Pfizer and its partner, the German company BioNTech, are also adjusting their vaccine prescription. They are consulting with US and European regulators on a study to evaluate adjusted doses more in line with viral strains, such as the variant first detected in the Republic of South Africa.
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