In the southwestern Brazilian city of Toledo, you won’t find much vaccine skepticism. About 98 percent eligible residents there have received at least one dose of a Covid vaccine, according to municipal officials. Most received the vaccine offered by Pfizer, and this week the drug maker said that presented an opportunity: Pfizer announced that it would fully vaccinate everyone in the city over the age of 12 so it can carry out a study of the safety and effectiveness of the vaccine.
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