Luke Hutchison woke up in the middle of the night with chills and a fever after taking the Covid-19 booster shot in Moderna’s vaccine trial. Another coronavirus vaccine trial participant, testing Pfizer’s candidate, similarly woke up with chills, shaking so hard he cracked a tooth after taking the second dose.
High fever, body aches, bad headaches and exhaustion are just some of the symptoms five participants in two of the leading coronavirus vaccine trials say they felt after receiving the shots.
In interviews, all five participants — three in Moderna’s study and two in Pfizer’s late-stage trials — said they think the discomfort is worth it to protect themselves against the coronavirus. Four of them asked not to be identified, but CNBC reviewed documentation that verified their participation in the trials.
While the symptoms were uncomfortable, and at times intense, they often went away after a day, sometimes sooner, according to three participants in the Moderna trial and one in Pfizer’s as well as a person close to another participant in Moderna’s trial.
The phase three trials are a critical last step needed to get the vaccines cleared for distribution. At least 41 Covid-19 vaccines are in human trials worldwide but only four U.S.-backed candidates are in phase three: Moderna, Pfizer, AstraZeneca and Johnson & Johnson. Health officials expect to have at least one safe and effective vaccine by the end of the year.
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