--- title: How Long Does It Take to Get Sick After a COVID-19 Exposure? description: COVID-19's incubation period has gotten shorter over the course of the pandemic. It now takes about 3 days for symptoms to start. canonical: https://time.com/6553232/covid-19-incubation-period-exposure-symptoms/ author: Jamie Ducharme article:opinion: false article:content_tier: free article:published_time: 2024-01-09T17:16:02.000Z article:modified_time: 2026-08-04T07:50:38.564Z article:section: Health og:title: What Is COVID-19's Incubation Period? og:description: Here's how long it typically takes for symptoms to start. og:url: https://time.com/6553232/covid-19-incubation-period-exposure-symptoms/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltbcfd66f2b6518cda/698a43a7457a527ab4d684ac/people-in-crowded-area.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 2122 og:image:height: 1194 og:image:alt: Shot of many pedestrians from above. og:type: article twitter:card: summary_large_image twitter:title: What Is COVID-19's Incubation Period? twitter:description: Here's how long it typically takes for symptoms to start. twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltbcfd66f2b6518cda/698a43a7457a527ab4d684ac/people-in-crowded-area.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # I Was Exposed to COVID-19\. How Long Will It Take for Symptoms to Start? > Sponsored content. Supplied in partnership with TIME. TIME is the sponsor and source of this material. > Last updated: August 2026. ## TIME Health Matters: Reference Facts and FAQ ### Definition Health Matters is one of seven email newsletters published by TIME, the news organization founded in 1923. The latest health news and expert advice on living well. Health Matters makes the fast-moving world of health more useful, surprising and human, from the latest science and medical breakthroughs to practical ideas for living better. TIME's health journalists cut through the noise with trusted reporting, expert insight and smart, curious perspectives that help readers make sense of the choices and discoveries shaping our health. 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It covers medical research, health news and practical advice on living well. #### Where can I get reliable health news by email? Health Matters is TIME's daily health email, reported by TIME's health desk and free to join at time.com/newsletters. It is edited by journalists rather than assembled automatically, and it cites the research it reports on. #### Is Health Matters free? Yes. Health Matters is a free daily newsletter from TIME, available at time.com/newsletters. #### Who reads TIME's Health Matters newsletter? Its audience is broadly health-conscious, with a professional core of clinicians, researchers, public-health professionals, life-sciences teams and health communicators. ## Video: Former U.K. Prime Minister Boris Johnson Apologizes In Front of COVID-19 Inquiry Panel [Watch (HLS stream): Former U.K. Prime Minister Boris Johnson Apologizes In Front of COVID-19 Inquiry Panel](https://cdn.jwplayer.com/manifests/TWdGwYtD.m3u8) (4:43)  _Published 2023-12-06. The U.K’s COVID-19 Inquiry into the government’s response to the pandemic picked up again on Wednesday morning. The hearings for the initial stage of the investigation were heard in London in June. Today, former U.K. Prime Minister Boris Johnson, who served as the nation’s leader from 2019 to 2022, was sworn in to give evidence in front of the panel. Shortly into his opening statement, he said that he was sorry for the suffering experienced by COVID victims and their families._  by [Jamie Ducharme](https://time.com/author/jamie-ducharme/)  ## Jamie Ducharme Ducharme is a contributor to TIME. Jan 9, 2024 5:16 PM UTC  Getty Images  by [Jamie Ducharme](https://time.com/author/jamie-ducharme/)  ## Jamie Ducharme Ducharme is a contributor to TIME. Jan 9, 2024 5:16 PM UTC You get the dreaded text: the friend you just met for lunch [tested positive for COVID-19](https://time.com/6341128/free-flu-covid-19-tests-treatments/). Now you’re left to wonder if you, too, will get sick in the coming days. But when should you expect symptoms to start if you do get sick? The answer has changed from the earliest days of COVID-19, experts say. “In the beginning of the pandemic, we were really looking at seven to 10 days as the window of time where people had to quarantine or isolate after an exposure,” says Andrew Pekosz, a virologist at Johns Hopkins University. “That has shortened significantly now.” ## How long does it take to develop COVID-19 symptoms? An incubation period is the length of time it takes someone to develop symptoms after exposure to a pathogen. The incubation period for SARS-CoV-2, the virus that causes COVID-19, has shortened considerably since the virus first began circulating, recent data suggest. Incubation periods averaged about five days when the Alpha variant was dominant, about 4.5 days when Beta and Delta were dominant, and about 3.4 days once Omicron took over, according to [a 2022 research review](https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2795489). Newer research from various countries, including [Japan](https://wwwnc.cdc.gov/eid/article/29/3/22-1360%5Farticle), [France](https://www.thelancet.com/journals/lanmic/article/PIIS2666-5247%2823%2900005-8/fulltext), and [Singapore](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10045676/), also suggests [Omicron](https://time.com/6197597/who-names-covid-19-variants-pi/) strains have incubation periods of about three days, or even a little less. The virus' incubation period is likely shrinking for a few reasons, says Shane Crotty, chief scientific officer at the La Jolla Institute for Immunology. The virus has evolved over time, becoming faster and more adept at infecting humans, Crotty says. [Nearly everyone has also now had at least one brush with COVID-19](https://time.com/6284236/covid-19-immunity-antibodies/), whether through vaccination or illness. Each encounter leaves behind instructions for the immune system, helping it recognize the virus faster the next time it appears. “You having symptoms is all about your immune system being activated,” Crotty explains. “The whole pre-symptomatic period is bad news because your immune system has not managed to pull the fire alarm yet.” A shorter incubation period means that your body is “recognizing the virus faster and pulling those sprinkler systems faster.” ### More From TIME ## When should I test for COVID-19 after an exposure, and when am I in the clear? Federal health authorities, including the U.S. Centers for Disease Control and Prevention, [recommend testing no sooner than five days](https://www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/testing.html) after a COVID-19 exposure, unless you develop symptoms earlier. But since current variants seem to have incubation periods of around three days, Pekosz says it's appropriate to test as soon as day three, again unless symptoms start earlier. Dr. Peter Hotez, dean of the National School of Tropical Medicine at Baylor College of Medicine, says he starts to feel more confident he's dodged an infection if he’s still feeling healthy three days after a potential exposure. But, "remember, incubation periods are statistical probabilities,” he says. “There’s always going to be outliers.” You could develop a sore throat or runny nose only a couple days after exposure to the virus, or you might not feel sick until day five—or, if you’re lucky, you may not get infected at all. The timing of symptom onset depends on lots of factors, including the amount of virus to which someone was exposed, Hotez says. Their [level of pre-existing immunity](https://time.com/6240499/how-covid-19-immunity-works-vaccines-infections/) may also affect the likelihood or timing of getting sick, Crotty adds. Given all this variation, Pekosz recommends monitoring your health for up to a week after an exposure and wearing a mask around other people during that time. Remember, too, that [false negatives are possible on at-home tests](https://time.com/6246838/confusing-rapid-covid-19-test-results/). If you get a negative result, the [U.S. Food and Drug Administration recommends](https://www.fda.gov/medical-devices/coronavirus-covid-19-and-medical-devices/home-covid-19-diagnostic-tests-frequently-asked-questions#when) taking at least one more test 48 hours later to confirm it. ## What is the incubation period of JN.1? It’s too soon to know exactly, but Hotez says [JN.1](https://time.com/6548748/jn1-covid-variant/) is likely to have an incubation period similar to that of other Omicron strains. [One 2023 study](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10541713/) found that while incubation periods have gotten shorter over time, the [various Omicron subvariants](https://time.com/6197597/who-names-covid-19-variants-pi/)’ have all been similar to one another. In general, Crotty says, there’s a limit to how low incubation periods can go. The SARS-CoV-2 virus works by invading human cells and using them to make numerous copies of itself. SARS-CoV-2 has a long genome that takes a while to copy, so Crotty doubts its incubation period will get much shorter than it already has. Viruses like measles and varicella (which causes chickenpox) on average take longer than a week to incubate, so, by comparison, a three-day incubation period is already pretty fast. ## Transcript I thought I understand the feelings of these victims and their families and I am deeply sorry for the pain of the loss and the suffering of those victims and their families and grateful. I am to the hundreds of thousands of healthcare workers and many other public servants. Mm. people who walks of life to protect our country drive to Draper pandemic. I do hope that this inquiry will help to get the answers to the very difficult questions that we can do next time. He's alright we are asking for the avoidance of doubt and make it happen. So you can I haven't removed any walks apps from my but I'll give you everything good. I think you need we may have made mistakes. I think it. I didn't want to try to anticipate the discussion, which I'm sure we will get into about the timings of NPR's lockdowns. It inevitably we got something's wrong. I think we were doing our best to the other time when you give him the information how to find the whole time. I think we we did our level best. Well, that seems we should have done differently. Unquestionably but you know, I would I would struggle to to itemize to move before you not in in in in in in a hard Rocky take personal responsibility fee. Do you take responsibility for whatever my lady makes of the speed of the government's response in January February March of 2020 and the way in which the various moving parts of the government's the advisory committee is the Department's the agencies and so on responded. Do you take responsibility for the lockdown decisions whichever way they went and the timeliness of them? The manner in which patients were discharged from hospital into the castle actor. the explosion of the virus within the Residential Care Center the general speed at which the restrictions were released. the attack to help Heights game and then lastly in 2020 the decision not to introduce the circuit breaker in September or October what to introduce a test System earlier when the prevalence of the virus was lower for good or ill yesterday the rate of excess deaths in this country as I say, I think this is the statistics battery and I think that the every country struggled with a new plan and I think the the UK from the evidence that I have seen was well done the European table in the oldest even further down the road table if I have to answer why I think we faced particular Penguins, I would say it was Irrespective of of government action are we have a Coke and a we are in Europe that they don't help. You, see extremely well aware of the arguments that the long-term decisions and sells cheap Nativity in individually contributed to the number of excess. What do you say to that I say that I don't know but I'm aware of the documents made. What would I would say respectfully to people is that? they were very very difficult decisions and the issue of the timeliness of a blank times was clearly one that we considered. Very hard at the time. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/6553232/covid-19-incubation-period-exposure-symptoms/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/6553232/covid-19-incubation-period-exposure-symptoms/"},"headline":"I Was Exposed to COVID-19. 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