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Volunteers who received two of the potential coronavirus vaccines in the United States spoke about the side effects they experienced after their injections.
This month, Moderna and Pfizer announced that their vaccine candidates had been tested to 94.5% and 95% effectiveness, respectively.
Jennifer Haller, who was injected with the experimental vaccine from Moderna in Seattle on March 16, told WVPI-TV that she had only experienced mild side effects.
“I received two doses of the vaccine four weeks apart,” she told the broadcaster.
“Each time my arm was quite sore the next day, but other than that I personally didn’t experience any other side effects.
Ms Haller was the first person to receive a photo of Moderna’s candidate at the Kaiser Permanente Washington Health Research Institute as part of the first human trial of a vaccine to prevent the virus.
California resident Daniel Horowitz, who participated in Pfizer’s Covid-19 vaccine trial in September, described flu-like symptoms to WVPI.
Pfizer’s trial is double-blind, which means doctors and patients don’t know who is getting the vaccine or the placebo, so Horowitz doesn’t know if he received the vaccine.
However, he told the broadcaster that he also experienced mild side effects after the shot.
“My muscles a little bit, like… I just don’t feel well and it’s gone after that day,” he says.
Pfizer submitted its vaccine to the United States Food and Drug Administration (FDA) for emergency use on November 20, and Moderna will submit its vaccine later this month.
Common side effects of vaccines include pain, swelling or redness at the injection site, mild fever, chills, fatigue, headache, and muscle and joint pain.
The US Department of Health and Human Services says the most common side effects are a sign that your body is starting to develop immunity to a disease.
“25 to 50% of people might experience mild side effects after their first dose,” Dr. Peter Chin Hong, infectious disease specialist at the University of California, San Francisco, told WVPI-TV.
“But, after the second one, there may be more people who might experience some of these side effects and they might go away in a day or two.”
A total of 30,000 people participated in Moderna’s latest vaccine trial. More than 43,500 volunteers from six countries participated in the Pfizer trial.
Volunteers who received Pfizer’s coronavirus vaccine reportedly said earlier this month that the vaccine left them with side effects that resembled a “severe hangover.”
Operation Warp Speed, an initiative created by the U.S. government to facilitate vaccine development, said it plans to ship vaccines to vaccination sites within 24 hours of their approval by the FDA.
More than 12.8 million people have been infected with the novel coronavirus in the United States since the epidemic struck the country in March, leading to the deaths of nearly 262,000 people.
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