shingles vaccine and covid vaccine timing

other information we have about you. Here, learn how it develops, whether it is contagious, and how to prevent it. However, if you have a moderate to severe illness or a fever of 101.3 or higher, you should recover before getting your shingles vaccine. Accessed Sept. 9, 2021. Dr. Siham Mahgoub, Medical Director for Center of Infectious Diseases Management and Research (, Centers for Disease Control and Prevention- ". You can also develop shingles after having COVID-19. The shingles vaccine is approved for adults age 50 and older and for those 18 and older whose immune systems are weakened or who will be at increased risk of herpes zoster because of a disease. (2022). Patients can sign up on the Shingrix website to receive a second dose reminder, but doing so requires knowledge and action by patients. Varicella zoster reactivation following COVID-19 vaccination: A report of 3 cases. (2021). (2021). Compared to 2019, shingles vaccinations dropped by 89 percent early in the pandemic, although rates began climbing again later in 2020. Its safe to receive your COVID-19 and flu vaccine at the same time. include protected health information. Healthline Media does not provide medical advice, diagnosis, or treatment. The people in the second group had no known history of receiving a COVID-19 vaccine. If we combine this information with your protected All rights reserved. Shingles vaccination is availableto everyone aged 70 to 79. *Healthcare providers should defer vaccination for patients with suspected or confirmed COVID-19, regardless of symptoms, until the patient has met the criteria for discontinuing isolation. It is possible that out-of-pocket costs deterred some beneficiaries from getting the follow-up shingles vaccine, but other factors may also be barriers to completing the series, such as lack of communication between providers and patients or misunderstanding about the necessity of the second dose, the hassle factor of a return visit to a doctors office or pharmacy for the second shot, or being deterred by adverse effects after the first dose. A GP will tell you how long to wait after you recover from shingles before having the shingles vaccine. Some experts recommend that it can be a good idea for people with autoimmune diseases to get the COVID-19 vaccine. The most common side effects of the COVID-19 vaccine include: Side effects felt throughout your body are typically more common after receiving the second and booster doses of the COVID-19 vaccine. Real-world evidence from over one million COVID-19 vaccinations is consistent with reactivation of the varicella-zoster virus. You can unsubscribe at any time. COVID-19 booster vaccines: Are they safe and effective? Are people whove had COVID-19 more likely to develop shingles? Check your plan. Shingles vaccine side effects may include fatigue, headache, muscle pain and nausea. This chance increased to 21% for individuals who experienced hospitalization for COVID-19. I know it's the flu season, they might need a tetanus shot, they might need a pneumonia shot. Some may experience fatigue, headache, and fever. Last medically reviewed on January 18, 2022. You should not have the shinglesvaccine if you've had a serious allergic reaction (including an anaphylactic reaction)in the pastto a previous dose of the shingles vaccine, or to any of the ingredients in the vaccine, or to a previous dose of varicella (chickenpox) vaccine. Shingles is a painful skin condition caused by the reactivation of the chickenpox virus. Increased risk of herpes zoster in adults 50 years old diagnosed with COVID-19 in the United States. (2022). But when the immune system gets weakened, the virus can wake up (reactivate) and cause shingles. Six months later she died from a vegetation that grew on her heart. Can poor sleep impact your weight loss goals? Vaccines and preventable diseases. This analysis is based on 2018 Medicare Part D prescription drug event claims data from a 20% sample of Medicare beneficiaries from the Centers for Medicare & Medicaid Services (CMS) Chronic Conditions Data Warehouse (CCW). Vaccination and SARS-CoV-2 Laboratory Testing Vaccination and SARS-CoV-2 Infection Considerations Involving Pregnancy, Lactation, and Fertility Special Populations and Situations This page has answers to commonly asked questions about the Interim Clinical Considerations for COVID-19 Vaccination. ages 18 years and older who have an increased risk of . Its possible that it could happen due to immune system changes that happen after getting a vaccine. The good news is that the shingles vaccine, called Shingrix, is more than 90% effective at preventing shingles. Yes. You can also try the following at home that may help you recover: You can help prevent shingles by receiving the shingles vaccine. What should I do if a patient waits longer than 6 months to get the second dose? The COVID-19 virus is no exception. Shingles is a common disease almost 1 in 3 people will get shingles in their lifetime. While experts do not know yet what causes VZV to reactivate, experts believe that the reactivation happens due to factors that can lower immunity, such as: Doctors can treat shingles with antiviral drugs. The flu vaccine can help prevent illness and reduce the risk of serious flu-related complications in vulnerable individuals, such as: Its important to get the COVID-19 and shingles vaccines when youre eligible. Shingles is a painful rash that usually develops on one side of the body, often the face or torso. It can be painful and last for up to a month. People who are older or have a weakened immune system are likely at higher risk of developing shingles during a COVID-19 illness. Some people also experience fatigue, headache and other side effects. These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. Hong K, et al. Accessed Sept. 9, 2021. This means you don't have to wait to receive your COVID-19 and shingles. However, more research is still necessary to investigate the association. The Food and Drug Administration (FDA) vaccine advisory group today recommended that that the agency approve GSK's RSV vaccine for people 60 and older, a day after it recommended Pfizer's RSV vaccine for the same age-group.. Typically, a doctor may recommend antiviral medications, as they can help treat shingles and shorten the length and severity of the illness. With the. All people in the study were ages 50 and older. Follow @jcubanski on Twitter Moreover, preliminary evidence showing that the two COVID-19 vaccines closest to FDA authorization are highly effective in preventing COVID-19, a potentially fatal disease, may translate to higher take-up rates for the second shot than we observed with Shingrix. If you havent had chickenpox or the chickenpox vaccine, experts suggest that getting a vaccine against chickenpox can help prevent the chickenpox infection. While evidence suggests this could be possible, it is at the very least uncommon. Anyone who has had chicken pox can develop shingles. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website. As the U.S. prepares for nationwide distribution of vaccines to combat COVID-19, some are asking whether people who get the first of two doses will return to complete the series. Shingles is also called herpes zoster. You can review and change the way we collect information below. So we can that currently, it's recommended to wait at least two weeks before and after COVID-19 vaccination to receive other immunizations. If a vaccine recipient develops emergency warning signs for COVID-19, emergency medical care should be sought immediately. Please seek medical advice before starting, changing or terminating any medical treatment. We avoid using tertiary references. Some studies suggest this may not be an adverse event and just a coincidence. And if you have shingles, you may be able to get your COVID-19 vaccine once youre feeling better. If more than 6 months have elapsed since the first dose, administer the second dose as soon as possible. In the United States, currently available vaccines include the following: Shingles results from the reactivation of VZV. If a patient experiences side effects, any local (e.g., redness, pain, swelling at the injection site) or systemic (e.g., fever, chills, headache, body aches) reactions normally resolve within 72 hours after vaccination. Its important to get the shingles vaccine, even if you: Shingrix is highly effective at protecting you from shingles and postherpetic neuralgia. https://www.fda.gov/vaccines-blood-biologics/vaccines/shingrix. Antivirals that can treat shingles include: Additionally, there are many home remedies people can try to help alleviate discomfort. Tricia Neuman These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests. Learn more about whats behind the shingles itch, where it occurs, what you can do to get relief, and when you should consider speaking with a doctor. If you didnt wait before or after getting your COVID shot, they say you dont need to be revaccinated. Shingles, also called herpes zoster, is a painful skin rash caused by the chickenpox virus (varicella-zoster virus). In general, the CDC advises that no other. 1998-2023 Mayo Foundation for Medical Education and Research (MFMER). The Centers for Disease Control and Prevention (CDC) recommends that adults ages 50 and older receive 2 doses of the shingles vaccine, Shingrix. Can COVID-19 increase the risk of herpes zoster? Katz, J., et al. The term COVID-19 refers to a disease caused by the SARS-CoV-2 virus. This is consistent with another 2021 article that suggests that an immune reaction following vaccination may allow VZV to escape from its latent phase and cause a shingles eruption. The CDC recommends adults ages 50 and older and immunocompromised adults ages 19 and over get two doses of Shingrix. The fact that the second dose of the two leading COVID-19 vaccine candidates is administered no more than one month after the first dose - versus up to 6 months between the first and second . The most common side effects of a shingles vaccine are redness, pain, tenderness, swelling and itching at the injection site, and headaches. This observation isnt specific to COVID-19. Garg, R. K., et al. Its best to discuss the timing with your healthcare provider. Getting. (Under Part D, a separate copayment is required for each dose in the series.) So let's Verify: Should you avoid getting other vaccines right before or after getting your COVID shot? Your doctor can answer any questions or concerns you may have about the timing of your COVID-19 and shingles vaccinations. Diez-Domingo J, et al. Do not restart the vaccine series. A narrative review. The FDA approved the shingles vaccine Shingrix to prevent shingles and possible health complications. In 2018, Medicare Part D enrollees without LIS paid an average of $57 out of pocket for each shot, while those who received LIS paid $5. ", If you get a #COVID19 vaccine, wait at least 14 days before getting any other vaccine, including those for flu or shingles. Opens in a new window. A doctor will be able to diagnose shingles and provide appropriate treatment. Shingles, sometimes called herpes zoster, is an infection caused by the varicella-zoster virus. Learn more about how we ensure our content is accurate, thorough, and unbiased by reading our. You may have. While this is possible, its still uncommon. Herpes zoster reactivation -- a.k.a. "Now COVID is the priority. (2022). Another great #vaccine in the making through #pfizer #biontech partnership and this time it is for #shingles Aiswariya Chidambaram, MHSM, PMP on LinkedIn: Pfizer and BioNTech Initiate Phase 1/2 Study of First mRNA-based Shingles They found that many people who got shingles after their vaccine had existing factors that can increase the likelihood of developing shingles. Desai HD, et al. Iwanaga, J., et al. It also causes chickenpox. All rights reserved. Decline in the receipt of vaccines by Medicare beneficiaries during the COVID-19 pandemic United States, 2020. The Zostavax shingles vaccine is currently free for Australians aged 70 and a catch-up scheme for those 71-79 is running until October. In a another 2022 study, researchers examined shingles in people who had experienced COVID-19 and people who had not. The CDC recommends the shingles vaccine for everyone over 50 years old. Zostavax is not suitable for people who have a weakened immune system due to a condition, treatment or medicine. Saving Lives, Protecting People. You'll also be less likely to get shingles complications, such as post-herpetic neuralgia. This protection remains high for at least 4 years. Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. Shingrix requires a 2-dose schedule, with the second dose administered from 2 months (and ideally within 6 months) following the first dose. The shingles vaccine is a safe and effective tool that can help prevent the condition in eligible adults. After recovery from chickenpox, the virus lays dormant in the sensory ganglia of the cranial nerve or the dorsal root ganglia within the peripheral nervous system. While more research is necessary, these findings may indicate the requirement for further vigilance and safety monitoring, particularly for those at higher risk of shingles. If a vaccine recipient develops symptoms of COVID-19 (e.g., cough or shortness of breath), or if fever does not resolve within 72 hours of vaccination without the use of fever-reducing medications, the recipient should contact their healthcare provider. We link primary sources including studies, scientific references, and statistics within each article and also list them in the resources section at the bottom of our articles. Healthcare providers should also counsel patients to consider the timing of vaccination based on personal and professional commitments. Most side effects of the shingles vaccine are mild and typically last only 2 to 3 days. Another very large study found that people older than 50 were 15% more likely to develop shingles if they had COVID-19 illness when compared to people of the same age who didnt get COVID-19 illness. The COVID-19 vaccine does not cause shingles only the varicella zoster virus causes shingles. Can You Get Shingles on the Back of Your Neck? Herpes simplex and herpes zoster viruses in COVID-19 patients. Herpes zoster (shingles). Experts do not know the reasons for this yet, but theyre likely related to immune system changes or dysfunction. GoodRx works to make its website accessible to all, including those with disabilities. This may be up to 1 year. Of those 414 cutaneous reactions, shingles was seen in 1 of 34 receiving first Pfizer vaccine (2.9% of cutaneous reactions) and 4 of 40 . The CDC agrees -- right now its at least a two-week waiting period on both ends. A weakened immune system, such as from an autoimmune disorder, can put you at a higher risk of developing shingles in general . Which babies should have the MenB vaccine? After you've recovered from chickenpox, the varicella-zoster virus lies dormant in your nerve cells and can reactivate at a later stage when your immune system is weakened. Annette Jackson from Bowie, Maryland, sent the Verify team his question: I took my Shingles vaccine about two weeks ago. The most common side effects of the shingles vaccine are redness, pain and swelling at the injection site. Our estimate of beneficiaries with incomes less than 150% of the federal poverty level (FPL) is based on the share of Part D enrollees receiving full or partial Part D Low-Income Subsidies (LIS). My grandmother got the COVID booster + the shingles vaccine at the same time. Introduction: Although the COVID-19 vaccination is deemed safe, exact incidence and nature if adverse effects, particularly dermatological ones, are still unknown. Side effects usually appear in the first few days after your first or second dose of the vaccine and disappear within . This is because the benefit of the vaccine outweighs the potential risks. Some studies suggest a link between COVID-19 vaccines and reactivation of the virus that causes shingles. Some people describe the pain as an intense burning sensation. Furthermore, a 2021 paper on older adults and a 2021 case series on people with an autoimmune condition highlight cases of shingles following COVID-19 vaccination. Xie Y, et al. Healthline Media does not provide medical advice, diagnosis, or treatment. Review/update the Everything You Need to Know About Shingrix, the Best Practices of the Advisory Committee on Immunization Practices (ACIP), Interim Clinical Considerations for Use of COVID-19 Vaccines, COVID-19 Vaccine FAQs for Healthcare Professionals, https://www.cdc.gov/vaccines/acip/meetings/index.html, National Center for Immunization and Respiratory Diseases, U.S. Department of Health & Human Services. You can get the shingles and COVID-19 vaccines at the same time. What is the time frame for recovery from shingles? Mayo Clinic is a nonprofit organization and proceeds from Web advertising help support our mission. Lets take a closer look at whether COVID-19 or the COVID-19 vaccine can cause shingles. Shingles, or herpes zoster, occurs when the dormant chickenpox virus is reactivated in nerve tissues. Discuss any health concerns with the GP or practice nurse before you have the vaccine. You can learn more about how we ensure our content is accurate and current by reading our. CDC twenty four seven. If you have a weakened immune system a GP or practice nurse will assess which vaccine is suitable for you. If you do get shingles, the vaccine is likely to make the symptoms milder and the illness shorter. Shingrix. Due to the potential health risk of COVID-19, scientists were able to develop vaccines to help protect people against COVID-19 by providing immunity to SARS-CoV-2. A sore arm and flu-like symptoms are common. How Long Does the Omicron Variant Last on Surfaces? Shingrix is also recommended for adults 19 years and older who have weakened immune systems because of disease or therapy. The CDC guidelines state that the COVID-19 vaccine may be given without regard to the timing of other vaccines. These vaccines contain harmless material from the virus that the immune system uses to help fight off infection. Here's what we are predicting for winter this year. Itchy Throat: Could It Be COVID-19 or Something Else? Immunity stays strong for at least the first 7 years after vaccination. Bhavsar, A., et al. "Mayo," "Mayo Clinic," "MayoClinic.org," "Mayo Clinic Healthy Living," and the triple-shield Mayo Clinic logo are trademarks of Mayo Foundation for Medical Education and Research. Albrecht MA, et al. The COVID-19 vaccine can be given with other vaccines. Centers for Disease Control and Prevention. Centers for Disease Control and Prevention (CDC), Frequently asked questions about shingles and vaccines, ncbi.nlm.nih.gov/pmc/articles/PMC9209775/, ncbi.nlm.nih.gov/pmc/articles/PMC8982770/, jaad.org/article/S0190-9622(21)02892-9/fulltext, ncbi.nlm.nih.gov/pmc/articles/PMC8597588/, ncbi.nlm.nih.gov/pmc/articles/PMC8126597/, onlinelibrary.wiley.com/doi/full/10.1111/jdv.18184, academic.oup.com/fampra/article/39/5/939/6542257, ninds.nih.gov/health-information/patient-caregiver-education/hope-through-research/shingles-hope-through-research, frontiersin.org/articles/10.3389/fimmu.2022.919979/full, Understanding What Causes Shingles to Activate. (2022). For more information, see CDCs Vaccination Guidance During a Pandemic. After this matching, they observed no increased risk of shingles between the two groups. Both shingles and COVID-19 are serious infections with potentially life-altering consequences, and both tend to strike the same population hardest: People over age 60 and those with. You may opt-out of email communications at any time by clicking on Furer, V., et al. I have a weak immune system, is it safe for me to get . Different viruses cause shingles and COVID-19. Some individuals may also develop health issues that continue for weeks or months. If you are a Mayo Clinic patient, this could These factors include older adulthood, immunological disorders, and cancer. Experts dont yet know why the COVID-19 vaccines may increase the risk of shingles. Some evidence notes that changes to the immune system could be the trigger that reactivates the virus. Accessed Sept. 9, 2021. A Study on the Immune Response and Safety of the Shingles Vaccine and the Influenza Vaccine When Either is Given to Healthy Adults at the Same Time or Following a COVID-19 Booster Vaccine The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Can you 'detox' from the COVID-19 vaccine? We take your privacy seriously. Share on Facebook. It does not guarantee you will not get shingles, but it will reduce your chances. How Viagra became a new 'tool' for young men, Ankylosing Spondylitis Pain: Fact or Fiction, https://ecevr.org/pdf/10.7774/cevr.2021.10.2.198, https://www.cdc.gov/coronavirus/2019-ncov/index.html, https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC8597588/, https://academic.oup.com/rheumatology/article/60/SI/SI90/6225015, https://www.mdpi.com/2076-393X/9/6/572/htm, https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC8071473/, https://medlineplus.gov/genetics/condition/shingles/, https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Hope-Through-Research/Shingles-Hope-Through-Research, https://www.aad.org/public/diseases/a-z/shingles-self-care, https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC8379763/. In this Special Feature, we look at why some people want to 'detox' COVID-19 vaccines and whether this is safe or even possible. Mr Blackall says if he had his time again and knew he was eligible, he . Can You Get the Virus that Causes Shingles from Your Parents Before Birth? This means you dont have to wait to receive your COVID-19 and shingles vaccinations. As such, its essential to receive both COVID-19 and flu vaccines. You can get your shingles and COVID-19 vaccines at the same time. For example, recent data from the United Kingdom has found that, compared to unvaccinated individuals, the risk of hospitalization with the Omicron variant is 65 percent and 81 percent lower in people whove had 2 doses and 3 doses of the COVID-19 vaccine, respectively. MNT is the registered trade mark of Healthline Media. Agrawal S, et al. As such, contact a doctor promptly if you suspect that you have shingles. Keep reading to learn more. The most recent research on the Omicron variant suggests it lives longer on surfaces than previous coronavirus variants. Is it safe to get your COVID-19 vaccine and flu shot at the same time? Even after people completely recover from chickenpox, the varicella virus can stay asleep (dormant) in the body by hiding in the spinal cord without causing any symptoms. While mild illness is not a contraindication to shingles vaccination, vaccination visits for these individuals should be postponed to avoid exposing healthcare personnel and others to the virus that causes COVID-19. Rheumatology. These can include cool oatmeal baths, using calamine lotion, and trying to avoid stress. Some people have chickenpox without displaying any of the typicalchickenpox symptoms, such as a rash. While the studies cannot prove causality, they suggest that it could be a plausible but rare AEAV. If you need to go back and make any changes, you can always do so by going to our Privacy Policy page. This article. But its not clear if COVID-19 vaccine can trigger a shingles outbreak. When this happens, it moves down the nerves until it reaches the skin, leading to the characteristic shingles rash. If youre at higher risk for developing shingles from COVID-19 or the vaccine, its a good idea to keep your shingles vaccination up to date. If the events are related, they will only occur in individuals with dormant VZV from a previous case of chickenpox or shingles. Click here for an email preview. Although some people will develop shingles despite vaccination, the vaccine may reduce the severity and . This article covers the connection between the COVID-19 vaccine and shingles, other common causes of shingles, and how doctors treat shingles. Everything You Need to Know About Shingrixexternal icon While evidence cannot attribute the flares to the vaccine, it may be possible that the immune response to the vaccine might trigger a flare. Notably, unlike the COVID vaccine which will be covered at no cost for Medicare beneficiaries, the Shingrix vaccine is not free to Medicare beneficiaries without LIS, but it is covered at very low cost to beneficiaries who receive LIS. (2021). Older individuals may be more likely to develop shingles after having COVID-19. The researchers also noted that their study didnt consider whether individuals included in their group had potential risk factors for shingles. U.S. Food and Drug Administration. This study compared shingles onset within a 28-day period after either receiving an mRNA vaccine or getting a diagnosis for another skin condition. But COVID-19 and shingles may be related. A 2021 article reports two cases of shingles eruptions in adults after vaccination with an mRNA COVID-19 vaccine. Make every effort to ensure that two doses are administered within the recommended 26 month interval. Can you get time off if you work to come back in? Page last reviewed: 31 August 2021 VZV reactivation links with other vaccines. They help us to know which pages are the most and least popular and see how visitors move around the site. Healthy adults age 50 and older should get vaccinated with the shingles vaccine, Shingrix, which is given in two doses. Shingles is also called herpes zoster. "Wait at least 14 days before getting any other vaccine, including a flu or shingles vaccine, after you get. Chickenpox can be serious in adults. A 2022 research review noted that current evidence generally doesnt support an increased risk of a flare-up following the COVID-19 vaccination. In this study, people over the age of 50 were at highest risk for developing shingles after COVID-19 illness. Implications for Coverage, Costs, and Access. Our sources are Dr. Siham Mahgoub, an infectious diseases expert from Howard University, and the CDC. New COVID-19 boosters could be authorized by the FDA before full data from human trials are in because of past data on similar vaccines. Varicella zoster virus reactivation following COVID-19 vaccination: A systematic review of case reports. "Or if you get any other vaccine first, wait at least 14 days before getting your COVID-19 vaccine. The shingles vaccine protects you from shingles and can also prevent postherpetic neuralgia, a common complication of shingles that can cause long-term pain. Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. "Wait at least 14 days before getting any other vaccine, including a flu or shingles vaccine, after you get your COVID-19 vaccine," the agency writes. 2005-2023 Healthline Media a Red Ventures Company. In addition, states and vaccine providers are being encouraged by the Centers for Disease Control and Prevention to attempt to schedule a second dose appointment at the time of a patients first dose. (2022). 2004-2023 Healthline Media UK Ltd, Brighton, UK, a Red Ventures Company. However, it also pointed out that flare-ups are still possible after vaccination, particularly in people with higher disease activity. Everyone else has to pay about $200 for the vaccine, which can be administered by a general practitioner or pharmacist in some states. Shingrix does not cause respiratory symptoms common in COVID-19, such as cough or shortness of breath. Released: 4/30/18. Birabaharan M, et al. Thank you for taking the time to confirm your preferences. However, more research is necessary. One of the most common side effects of the shingles vaccine is an injection site reaction. Anthony Damico Shingles is a reactivation of varicella zoster virus (VZV), the virus that causes chickenpox. It can also reduce the risk of postherpetic neuralgia, a shingles complication that causes shingles pain to continue long after the blisters have cleared. If you choose to do this, make sure to receive your injections at two different sites. [3:58 mins] Some studies suggest a link between COVID-19 vaccines and reactivation of the virus that. MMWR. Neurological Sciences. So the same vaccine cant protect against both viruses. A: Studies confirmed that Shingrix was safe and immunogenic when administered 5 or more years after Zostavax. Shingles can lead to complications like long-term nerve pain and keratitis, a vision-threatening eye infection. When you're eligible, you can have the shingles vaccination at any time of year. Irish Journal of Medical Science. Key Takeaways CDC officials now say it's OK to get the COVID-19 vaccine at the same time as other vaccines. CDC recommends two doses of recombinant zoster vaccine (RZV, Shingrix) to prevent shingles and related complications in adults 50 years and older. (2016). Is shingles contagious, and how does a person contract it. Centers for Disease Control and Prevention (CDC). (2021). the unsubscribe link in the e-mail. This is because its a live vaccine, meaning it uses a weakened form of VZV.

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