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Promising new Covid-19 vaccine will make you sick with flu-like symptoms, researchers say

Nov 13, 2020 | 39 comments

By Liz Szabo and JoNel Aleccia

Pfizer is expected to seek federal permission to release its Covid-19 vaccine by the end of November, a move that holds promise for quelling the pandemic but also sets up a tight time frame to make sure consumers understand what it will mean to get the shots.

The vaccine, and likely most others, will require two doses to work, injections that must be given weeks apart, company protocols show. Scientists anticipate that the shots will cause enervating flu-like side effects — including sore arms, muscle aches and fever — that could last days and temporarily sideline some people from work or school. And even if a vaccine proves 90 percent effective, the rate Pfizer touted for its product, 1 in 10 recipients would still be vulnerable. That means, at least in the short term, as population-level immunity grows, people can’t stop social distancing and throw away their masks.

Left out so far in the push to develop vaccines with unprecedented speed has been a large-scale plan to communicate effectively about those issues in advance, said Saad Omer, director of the Yale Institute for Global Health.

“You need to be ready,” he said. “You can’t look for your communication materials the day after the vaccine is authorized.”

Omer, who declined to comment on reports that he’s being considered for a post in the new administration of President-elect Joe Biden, called for the rollout of a robust messaging campaign based on the best scientific evidence about vaccine hesitancy and acceptance. The Centers for Disease Control and Prevention has created a strategy called “Vaccinate with Confidence,” but it lacks the necessary resources, Omer said.

The universal flu vaccine is on the way but there will be side effects.

“We need to communicate, and we need to communicate effectively, and we need to start planning for this now,” he said.

Such broad-based outreach will be necessary in a country where, as of mid-October, only half of Americans said they’d be willing to get a Covid-19 vaccine. Initial doses of any vaccine would be limited at first, but experts predict they may be widely available by the middle of next year. Discussing potential side effects early could counter misinformation that overstates or distorts the risk.

“The biggest tragedy would be if we have a safe and effective vaccine that people are hesitant to get,” said Dr. Preeti Malani, chief health officer and a professor of medicine at the University of Michigan in Ann Arbor.

Pfizer and its partner, the German company BioNTech, said Monday that their vaccine appears to protect 9 in 10 people from getting Covid-19, although they didn’t release underlying data. It’s the first of four Covid-19 vaccines in large-scale efficacy tests in the U.S. to have posted results.

Data from early trials of several Covid-19 vaccines suggest that consumers will need to be prepared for side effects that, while technically mild, could disrupt daily life. A senior Pfizer executive told the news outlet Stat that side effects from the company’s vaccine appear to be comparable to those of standard adult vaccines but worse than those of the company’s pneumonia vaccine, Prevnar, or typical flu shots.

The two-dose Shingrix vaccine, for instance, which protects older adults against the virus that causes painful shingles, results in sore arms in 78 percent of recipients and muscle pain and fatigue in more than 40 percent of those who take it. Prevnar and common flu shots can cause injection-site pain, aches and fever.

“We are asking people to take a vaccine that is going to hurt,” said Dr. William Schaffner, a professor of preventive medicine and health policy at Vanderbilt University Medical Center. “There are lots of sore arms and substantial numbers of people who feel crummy, with headaches and muscle pain, for a day or two.”
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Credit: Kaiser Health News

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