In the case of the COVID-19 case, it’s the adenovirus, a common virus that causes colds or flu-like symptoms.
Covid vaccine side effects how to#
Viral vector vaccines use a modified version of a different virus (the vector) to deliver instructions that teach cells how to fight the coronavirus infection. Learn more about how mRNA vaccines work.Īdenovector vaccines. 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. Likewise, a spokesperson for the European Medicines Agency (EMA) told Reuters that reports of suspected side effects from COVID-19 vaccines by patients and healthcare professionals “are not necessarily related to or caused by the vaccine”.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. This means, Pfizer would not have known about the suspected AEs prior to licensure. They also explained that VAERS is an “early warning system” that is used to establish any issues with vaccines or medicines that may have been missed before they were licenced. FDA requires healthcare providers to report any death after COVID-19 vaccination to VAERS, even if it’s unclear whether the vaccine was the cause.” The FDA spokesperson added: “In fact, reviews by FDA and CDC have determined that the vast majority of the deaths reported are not directly attributable to the vaccines. “In addition to our pharmacovigilance efforts and compliance with various regulatory requirements related to quality and safety, we also cooperate with the FDA and regulatory authorities around the world as they independently monitor the safety profile of our vaccine,” they said.Ī spokesperson for the FDA told Reuters that reports to VAERS post-vaccination “do not necessarily mean that a vaccine caused a health problem” – and anyone can submit a report, regardless of plausibility.
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