Beyond vaccines, cancer research has used mRNA to trigger the immune system to target specific cancer cells. mRNA vaccines have been studied before for influenza, Zika and rabies. Researchers have been studying and working with mRNA vaccines for decades. The vaccines made by Moderna and Pfizer-BioNTech use messenger RNA, or mRNA, to deliver a message to your immune system with instructions on how to fight the coronavirus infection. COVID-19 vaccine technologies have been studied for years and used in other treatments without issue. This history goes back to at least the 1960s with the oral polio vaccine and examples continue through today.īecause of this, scientists and public health officials continually monitor vaccine data before, during and after a vaccine becomes available to the public. When new vaccines are released, the unknown side effects, if any, show up within two months of vaccination. This is how the system is designed to work if unexpected side effects emerge. Upon reviewing information about the cases, federal health officials determined that the benefits of the vaccine outweighed the risk, and they approved resumed use of the vaccine. All of the cases emerged within two weeks of vaccination. The vaccine was put on pause when health officials learned that a small number of people who received the vaccine experienced a serious blood clotting problem.Ībout 7.4 million Americans had received the Johnson & Johnson vaccine when regulators paused its administration to investigate a handful of cases in which people had blood clots. The most recent example of this phenomenon is the Johnson & Johnson COVID-19 vaccine. History tells us that severe side effects are extremely rare, and if they do occur, they usually happen within the first two months. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.One of the reasons some people haven’t signed up to receive the COVID-19 vaccine is that they’re worried there might be unknown side effects that will show up months or years later.Īlthough it’s true there are still a lot of things we’re learning about the vaccines - like how effective they are against variants and how long their protection lasts - there are plenty of things we do know that give experts confidence in the long-term safety of the vaccines. These side effects may go away during treatment as your body adjusts to the medicine. Some side effects of sars-cov-2 (covid-19) mrna-1273 (bivalent booster) vaccine may occur that usually do not need medical attention.
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