![]() Learn more about how adenovirus vaccines work. (Again, they do NOT contain the coronavirus.) But the adenovirus in both the Johnson & Johnson and AstraZeneca vaccines can’t replicate, so there’s no way they can shed. The Johnson & Johnson and AstraZeneca vaccines are considered live vaccines because they both contain adenovirus. The mRNA vaccines – Pfizer and Moderna – are not live vaccines and do not replicate. Shedding can’t happen without a live vaccine. “We know that people with COVID-19 shed large amounts of virus from respiratory secretions,” says Dr. If someone has tested positive for COVID-19, though, they are shedding virus, including the spike protein, and contagious. "But it should not be shed in significant quantity in respiratory or other secretions.” “Spike protein is primarily made locally in muscle where the vaccine is administered and may possibly be seen in low levels in the blood," says Dr. Vaccines do not contain SARS-CoV-2, the virus that causes COVID-19. “We have no data to indicate that contact with somebody who has been vaccinated affects menstrual cycles,” says infectious diseases expert James Lawler, MD, MPH. The idea is that someone who has been vaccinated is shedding spike protein to those around them who have not been vaccinated. There have been rumors of “vaccine shedding” causing side effects to people who have not been vaccinated. Can “vaccine shedding” cause side effects in unvaccinated people? Call 800.922.0000 to schedule an appointment with an OB-GYN who can help. ![]() If you’re experiencing persistently abnormal periods, seek care. See why it helps to schedule your mammogram around a vaccine. These side effects often go away in a few days. Often people report fevers, body aches, headaches and pain at the site of injection. Vaccines sometimes do create an immune response that you can feel. “When millions of menstruating women are receiving the vaccine, the timing could certainly be coincidence.” “It’s not uncommon for women to experience an atypical cycle over the course of a year,” says Dr. ![]() They could be related, but it’s too soon to say for sure. That doesn’t necessarily mean the vaccine caused the abnormal period. Oral contraceptives and other medications can also change periods, especially if they change hormone levels.Ībnormal periods will also happen by chance after people receive the COVID-19 vaccine. Nebraska Medicine OB-GYN Karen Carlson, MD, writes about how pandemic stress can affect periods. Your period can fluctuate for many reasons, including diet, stress, exercise, illness and pregnancy. ![]() There’s also no biological mechanism, based on how the vaccines work, that would explain these occurrences.” “This was not identified in the clinical trials of the vaccines. ![]() “Some women have reported on social media that the period after a COVID-19 vaccine was different, or changed in some way from what they usually expect,” says OB-GYN Jennifer Griffin Miller, MD, MPH. Right now, there’s no scientific evidence that suggests COVID-19 vaccines are making periods irregular. Send us feedback about these examples.Are irregular periods a side effect of COVID-19 vaccines? Irregular periods include heavier bleeding than normal, early periods, late periods and similar changes. These examples are programmatically compiled from various online sources to illustrate current usage of the word 'spike protein.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. 2023 Typically targetting the SARS-CoV-2 spike protein, these drugs neutralize the virus by binding to the portion of the virus that infects our cells, preventing further spread. 2023 Once the vaccine's fatty package is delivered, our cells translate the mRNA code into a protein-the spike protein, in this case-which can then be used to train immune cells to identify and attack invaders with the same protein-in this case, SARS-CoV-2. 2023 Those that contain lots of spike proteins, which attach to human cells and start the process of getting the virus into the cells, are also more likely to spread. 2023 But the structure of these spike proteins can change as the virus evolves, causing vaccines to become less effective against new variants of the virus. 2023 The same day, vaccine developers started plotting how to make shots based on the SARS-CoV-2 gene coding for its spike protein. 2023 But additional mutations in the virus’s spike protein, which attaches to and infects human cells, has the potential to make the variant more infectious and even cause more severe disease. 2023 The nasal vaccine also previews the entire coronavirus for the body, not just its spike proteins like current Covid-19 vaccines do, so the hamsters were able to make immune weapons against a wider range of targets. Recent Examples on the Web Those cells could potentially be killed by the immune reaction to the spike protein. ![]()
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