U.S. begins study on allergic reaction risk in Moderna, Pfizer vaccines

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Healthcare professionals are also taking measures to ensure that any adverse reaction, if any, are immediately taken care of.

Britain's vaccine advisory committee said on Wednesday that an alternative to Oxford-AstraZeneca's vaccine should be given to under 30s where possible due to a "vanishingly" rare side effect of blood clots in the brain.

Of those reporting side effects, the researchers found that more participants impacted had received the Moderna vaccine compared to the Pfizer vaccine.

For this study, researchers looked at reports collected via a Centers for Disease Control and Prevention (CDC) programme called v-safe that tracks side effects in vaccine recipients.

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In late March they published the results of trials carried out with 2,260 adolescents in the United States who the companies said showed "robust anti-body responses". Reactogenicity refers to a subset of reactions that occur soon after vaccination. The gap widened after the second dose. Almost 51 percent of Moderna recipients had full-body symptoms, with 48 percent of those who took the Pfizer shot reporting similar reactions.

Almost 82 percent of people who got their second Moderna vaccine had injection site pain, compared to under 69 percent of those with Pfizer.

All participants in the study of 12- through 15-year-old volunteers will be monitored for two years, starting after they received their second dose, to watch for any safety issues and determine how long the vaccine protects recipients.

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