--- title: Moderna Reports COVID-19 Vaccine Results Among Teens description: The company says its vaccine is 100% efficacious in protecting 12- to 18-year olds from COVID-19 canonical: https://time.com/6050901/moderna-vaccine-teens/ author: Alice Park article:opinion: false article:content_tier: free article:published_time: 2021-05-25T13:14:12.000Z article:modified_time: 2026-02-24T09:58:43.530Z article:section: Health og:title: Moderna Reports COVID-19 Vaccine Results Among Teens og:description: The company says its vaccine is 100% efficacious in protecting 12- to 18-year olds from COVID-19 og:url: https://time.com/6050901/moderna-vaccine-teens/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt27d52e53ac100c1e/698a19ea457a527c68d6531f/GettyImages-1230581109.jpg?branch=production&width=1024&quality=75&auto=webp&crop=16:9 og:image:width: 1024 og:image:height: 576 og:image:alt: CZECH-HEALTH-VIRUS-VACCINATION og:type: article twitter:card: summary_large_image twitter:title: Moderna Reports COVID-19 Vaccine Results Among Teens twitter:description: The company says its vaccine is 100% efficacious in protecting 12- to 18-year olds from COVID-19 twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt27d52e53ac100c1e/698a19ea457a527c68d6531f/GettyImages-1230581109.jpg?branch=production&width=1024&quality=75&auto=webp&crop=16:9 ---  # Moderna Says Its COVID-19 Vaccine Is Safe and Works For Teens > Sponsored content. 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Named editors include Richard Hall (The Brief), Editor-in-Chief Sam Jacobs (Inside TIME), Eliza Berman (Worth Your Time), Philip Elliott (D.C. Brief), Justin Worland (Future Proof) and Harry Booth (In the Loop). Health Matters is written by TIME's health desk. #### How do I sign up for a TIME newsletter? Go to time.com/newsletters, choose the newsletters you want and enter your email address. There is no cost and no subscription requirement.  by [Alice Park](https://time.com/author/alice-park/)  ## Alice Park Senior Correspondent May 25, 2021 1:14 PM UTC  A doctor prepares a Moderna vaccine Covid-19 for an inhabitant of the "Home for the Elderly Kamenec" in Ostrava, Czech Republic, on January 14, 2021\. - Vaccination with the Moderna vaccine started in the Czech Republic on January 14, 2021\. (Photo by Radek Mica / AFP) (Photo by RADEK MICA/AFP via Getty Images) A doctor prepares a Moderna vaccine Covid-19 for an inhabitant of the "Home for the Elderly Kamenec" in Ostrava, Czech Republic, on January 14, 2021\. - Vaccination with the Moderna vaccine started in the Czech Republic on January 14, 2021\. (Photo by Radek Mica / AFP) (Photo by RADEK MICA/AFP via Getty Images) AFP via Getty Images  by [Alice Park](https://time.com/author/alice-park/)  ## Alice Park Senior Correspondent May 25, 2021 1:14 PM UTC In a [release](https://investors.modernatx.com/news-releases/news-release-details/moderna-announces-teencove-study-its-covid-19-vaccine) on May 25, Moderna says its vaccine is safe and efficacious among 12- to 18-year olds. The company reported results from its combined Phase 2 and 3 study involving more than 3,700 teens who were randomly assigned to receive either two doses of its COVID-19 vaccine or two doses of placebo. The study was designed to compare results among the teens to those among adults, which led to the company’s current emergency use authorization for its vaccine. Researchers are looking to see if the results among teens are at least as good, and not worse, than those among adults. And that’s what the company reported. There were no cases of COVID-19 reported 14 days after the teenage study participants received two doses of the shot, compared to four cases among those receiving a placebo, meaning the vaccine was 100% efficacious in protecting against disease. The company said that the vaccine was also 93% efficacious in protecting against even one symptom of COVID-19 disease after one dose. Moderna is the second company to report COVID-19 vaccine results among teens; in March, Pfizer-BioNTech [reported](https://time.com/5951361/pfizer-biontech-covid-19-vaccine-teens/) similar safety and efficacy of 100% in its study and received [authorization from the FDA](https://time.com/6047384/teens-pfizer-covid-vaccine/) for its two-dose shot among teens in May. Both Moderna and Pfizer-BioNTech vaccines are built on mRNA technology, which involves using genetic material from the COVID-19 virus to train the immune system to fight it. Moderna plans to submit the latest data from the teens to the U.S. Food and Drug Administration to expand the current authorization for its vaccine to children as young as 12 years old. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/6050901/moderna-vaccine-teens/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/6050901/moderna-vaccine-teens/"},"headline":"Moderna Says Its COVID-19 Vaccine Is Safe and Works For Teens","datePublished":"2021-05-25T13:14:12.000Z","dateModified":"2026-02-24T09:58:43.530Z","description":"The company says its vaccine is 100% efficacious in protecting 12- to 18-year olds from COVID-19","url":"https://time.com/6050901/moderna-vaccine-teens/","keywords":["COVID-19"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt27d52e53ac100c1e/698a19ea457a527c68d6531f/GettyImages-1230581109.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Alice Park","jobTitle":"Senior Correspondent","url":"https://time.com/author/alice-park/"}],"articleSection":"Health","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt27d52e53ac100c1e/698a19ea457a527c68d6531f/GettyImages-1230581109.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"CZECH-HEALTH-VIRUS-VACCINATION","caption":"CZECH-HEALTH-VIRUS-VACCINATION","creditText":"AFP via Getty Images","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/health/","name":"Health"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/covid-19/","name":"COVID-19"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/6050901/moderna-vaccine-teens/","name":"Moderna Says Its COVID-19 Vaccine Is Safe and Works For Teens"}}]}] ```