omicron incubation period cdc

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. Pulmonary Aspects of COVID-19. Chest. MMWR Morb Mortal Wkly Rep. Nov 6 2020;69(44):1641-1647. doi:10.15585/mmwr.mm6944e3, Jamieson DJ, Rasmussen SA. The earliest date of symptom onset was November 15 in a person with a history of international travel. "Omicron has the shortest incubation period. Coronavirus disease 2019 pregnancy outcomes in a racially and ethnically diverse population. Use of At-Home COVID-19 Tests United States, August 23, 2021March 12, 2022. In adults, age is the strongest risk factor for severe COVID-19. Lancet. He says multiple studies have shown that "there's very little, if any, transmission after day 10, regardless of the variant . Omicron is now the most dominant strain of coronavirus in the U.S., and its incubation period may be shorter than those of previous variants. All authors have completed and submitted the International Committee of Medical Journal Editors form for disclosure of potential conflicts of interest. For COVID-19, this can reach up to 14 days after virus exposure. MMWR Morb Mortal Wkly Rep. Apr 8 2022;71(14):524-526. doi:10.15585/mmwr.mm7114a2, Slezak J, Bruxvoort K, Fischer H, Broder B, Ackerson B, Tartof S. Rate and severity of suspected SARS-Cov-2 reinfection in a cohort of PCR-positive COVID-19 patients. 1. The first U.S. case of COVID-19 attributed to the Omicron variant was detected on December 1, 2021. American Journal of Clinical Pathology. University of Texas at Austin. COVID-19 Cases and Hospitalizations by COVID-19 Vaccination Status and Previous COVID-19 Diagnosis - California and New York, May-November 2021. Among the cases described in this report, the earliest report of symptom onset was November 15. Among these cases of COVID-19 attributed to the Omicron variant, 34 (79%) occurred inpersons whocompleted the primary series of an FDA-authorized or approved COVID-19 vaccine 14 days before symptom onset or receipt of a positive SARS-CoV-2 test result, including 14 who had received an additional or booster dose; five of the 14 persons had received the additional dose <14 days before symptom onset. Underlying Medical Conditions and Severe Illness Among 540,667 Adults Hospitalized With COVID-19, March 2020-March 2021. Trends in Geographic and Temporal Distribution of US Children With Multisystem Inflammatory Syndrome During the COVID-19 Pandemic. Pediatr Infect Dis J. Apr 1 2022;41(4):315-323. doi:10.1097/inf.0000000000003449, Abrams JY, Belay ED, Godfred-Cato S, et al. The risk of severe COVID-19 increases with increasing age over 40 years and with increasing number of certain, Shortness of breath or difficulty breathing. The Centers for Disease Control and Prevention recently shortened its isolation guideline s, citing evidence that COVID is most contagious 1 to 2 days before someone starts feeling symptoms and 2 to 3 days after. Genomic evidence for reinfection with SARS-CoV-2: a case study. 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. Mar 2 2022;376:e068632. Lancet Reg Health Eur. Incubation periods for Omicron BA.1 were reported to be 3.3 days in Norway, 4.6 days in South Korea, 3.2 days in the Netherlands, 3.1 days in Spain, and 2.9 days in Japan ( 6, 10, 11 ); incubation period for BA.2 was 4.4 days in Hong Kong ( 12 ). MMWR Morb Mortal Wkly Rep. Sep 10 2021;70(36):1249-1254. doi:10.15585/mmwr.mm7036e1, Cloete J, Kruger A, Masha M, et al. doi:https://doi.org/10.1016/S2352-3026(20)30145-9, Sadiq Z, Rana S, Mahfoud Z, Raoof A. CDC is not responsible for the content BA.5 is a subvariant of the SARS-CoV-2 Omicron variant (1). Demographic Disparities in Clinical Outcomes of COVID-19: Data From a Statewide Cohort in South Carolina. Nasal congestion. COVID19 in childhood: Transmission, clinical presentation, complications and risk factors. Distinguishing Multisystem Inflammatory Syndrome in Children From COVID-19, Kawasaki Disease and Toxic Shock Syndrome. Data from December 2021 suggests that Omicrons average incubation period is around two to four days, which would mean that symptoms may develop faster after exposure compared to other variants. mmwrq@cdc.gov. (14) Some skin manifestations may be associated with increased disease severity. Feb 24 2022;386(8):713-723. doi:10.1056/NEJMoa2117995, Price AM, Olson SM, Newhams MM, et al. Accessed December 3, 2021. Sect. According to . 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. MMWR Morb Mortal Wkly Rep. Sep 10 2021;70(36):1235-1241. doi:10.15585/mmwr.mm7036a1, Bull-Otterson LB, S.; Saydah, S.; Boehmer, T.; Adjei, S.; Gray, S.; Harris, A. PostCOVID Conditions Among Adult COVID-19 Survivors Aged 1864 and 65 Years United States, March 2020November 2021. . Apr 2022;21(4):435-451. doi:10.1080/14760584.2022.2035222, Lee A, Wong SY, Chai LYA, et al. Anyone exhibiting symptoms should get tested for COVID-19. CDC twenty four seven. 2022;386(8):744-756. doi:10.1056/NEJMoa2116597, Lansbury L, Lim B, Baskaran V, Lim WS. Disparities in First Dose COVID-19 Vaccination Coverage among Children 5-11 Years of Age, United States. Ogata T, Tanaka H. SARS-CoV-2 Incubation Period during the Omicron BA.5Dominant Period in Japan. Multisystem Inflammatory Syndrome in Adults After Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infection and Coronavirus Disease 2019 (COVID-19) Vaccination. Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data. doi:10.1503/cmaj.202604, Allotey J, Stallings E, Bonet M, et al. 2020:1-7. doi:10.1080/14767058.2020.1793320, Grechukhina O, Greenberg V, Lundsberg LS, et al. Assignment of epidemiological lineages in an emerging pandemic using the pangolin tool. The 95th percentile distribution for incubation period was estimated at 4.5 (95% CI 4.14.9) days during the BA.5dominant period, 5.2 (95% CI 4.65.9) days during the BA.1dominant period, and 6.1 (95% CI 5.56.8) days during the Delta-dominant period (Table 1; Figure). On December 10, 2021, this report was posted online as an MMWR Early Release. May 2022;28(5):986-989. doi:10.3201/eid2805.220166, Saelee R, Zell E, Murthy BP, et al. Community and close contact exposures associated with COVID-19 among symptomatic adults. Thank you for taking the time to confirm your preferences. SARS-CoV-2 Incubation Period during the Omicron BA.5Dominant Period in Japan. Some older adults can experience COVID-19 infection accompanied by delirium, falls, reduced mobility or generalized weakness, and glycemic changes. 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. Department of Health and Human Services. Patient data during the BA.1dominant and Delta-dominant periods were obtained from previous studies (6,7). As of December 8, one of these pools was confirmed positive for Omicron, and four were pending. JAMA Network Open. N Engl J Med. Clin Infect Dis. * International travel within 14 days of symptom onset or, if asymptomatic, first positive SARS-CoV-2 test result. Cough. BMJ. Notes from the Field: SARS-CoV-2 Omicron Variant Infection in 10 Persons Within 90 Days of Previous SARS-CoV-2 Delta Variant Infection - Four States, October 2021-January 2022. COVID-19 Incidence and Death Rates Among Unvaccinated and Fully Vaccinated Adults with and Without Booster Doses During Periods of Delta and Omicron Variant Emergence - 25 U.S. Jurisdictions, April 4-December 25, 2021. Aug 24 2022;75(1):e1165-e1175. Attributes and predictors of long COVID. Use of trade names and commercial sources is for identification only and does not imply endorsement by the U.S. Department of A wide range of dermatologic manifestations have been associated with COVID-19; timing of skin manifestations in relation to other COVID-19 symptoms and signs is variable. Saving Lives, Protecting People. (9), Fever, cough, shortness of breath, fatigue, headache, and myalgia are among the most commonly reported symptoms in people with COVID-19. According to earlier CDC guidance, COVID symptoms can appear anywhere from two to 14 days after someone is exposed to the virus. Meta-analyses of studies published in 2020 identified a pooled mean incubation period of 6.5 days from exposure to symptom onset. Dr. Ogata has been engaged in the field of public health for 40 years as a medical officer and is the director of the Itako Public Health Center. Centers for Disease Control and Prevention. We extracted data for 266 infector/infectee pairs who had 1 definite date of SARS-CoV-2 exposure as follows: 122 infectees from 108 infectors during the Omicron BA.5dominant period, 68 infectees from 49 infectors during the BA.1dominant period, and 76 infectees from 51 infectors during the Delta-dominant period. Infectees exposed while eating do not normally wear masks and may share longer exposure times, so they might be exposed to a higher viral load than those exposed through conversations while wearing a mask. Implementation of concurrent prevention strategies, including vaccination, masking, increasing ventilation, testing, quarantine, and isolation, are recommended to slow transmission of SARS-CoV-2, including variants such as Omicron, and to protect against severe illness and death from COVID-19. Aug 2020;25(32)doi:10.2807/1560-7917.Es.2020.25.32.2001483, Eyre DW, Taylor D, Purver M, et al. The utility of iPhone oximetry apps: A comparison with standard pulse oximetry measurement in the emergency department. doi:10.1097/inf.0000000000003435, Marks KJ, Whitaker M, Agathis NT, et al. the date of publication. Jun 1 2021;4(6):e2111182. As the dominant circulating strain of SARS-CoV-2 evolved from Alpha to Omicron, the incubation period from infection to symptoms or first positive COVID-19 test result gradually decreased, from 5 to 3.4 days, according to a systematic review and meta-analysis published today in JAMA Network Open.. National Institute for Communicable Diseases. Conclusions. Original Publication Date: January 31, 2023, Table of Contents Volume 29, Number 3March 2023. Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data. COVID-19 vaccine effectiveness among immunocompromised populations: a targeted literature review of real-world studies. Data from December 2021 suggests that Omicron's average incubation period is around two to four days, which would mean that symptoms may develop faster after exposure compared to other variants. The Journal of Maternal-Fetal & Neonatal Medicine. study . Cmaj. Emerg Infect Dis. Suggested citation for this article: . Pediatr Infect Dis J. Dec 1 2021;40(12):e482-e487. The CDC's researchers point out that Omicron's incubation period is definitely shorter than the original SARS-CoV-2 (five days or greater) and the Delta variant (four days). Emerg Infect Dis. The estimated mean incubation period for patients during the BA.5dominant period was 2.6 (95% CI 2.52.8) days, and the median was 2.5 (95% CI 2.32.7) days. This decision was based on the evidence presented to the TAG-VE that Omicron has several mutations that may have an impact on how it behaves, for example . Apr 2021;27(4):626-631. doi:10.1038/s41591-021-01292-y, Daugherty SE, Guo Y, Heath K, et al. On November 26, a Presidential Proclamation suspended entry into the United States for noncitizens (as immigrants and nonimmigrants) who were present in any of eight countries in southern Africa (Botswana, Eswatini, Lesotho, Malawi, Mozambique, Namibia, South Africa, and Zimbabwe) during the 14 days preceding travel to the United States. doi:10.1093/cid/ciab991, Davis HE, Assaf GS, McCorkell L, et al. Five pools collected November 30December 6, representing 59 travelers, had evidence of SGTF. Incubation period correlated with shared meals and adult infectors. https://www.whitehouse.gov/briefing-room/presidential-actions/2021/11/26/a-proclamation-on-suspension-of-entry-as-immigrants-and-nonimmigrants-of-certain-additional-persons-who-pose-a-risk-of-transmitting-coronavirus-disease-2019external icon, https://www.cdc.gov/quarantine/fr-proof-negative-test.html, *** https://www.cdc.gov/quarantine/order-collect-contact-info.html, https://www.cdc.gov/coronavirus/2019-ncov/php/contact-tracing/contact-tracing-plan/overview.html, https://www.cdc.gov/coronavirus/2019-ncov/your-health/quarantine-isolation.html, https://www.cdc.gov/quarantine/masks/mask-travel-guidance.html, **** https://www.cdc.gov/coronavirus/2019-ncov/travelers/international-travel/index.html. Global Impact of Coronavirus Disease 2019 Infection Requiring Admission to the ICU: A Systematic Review and Meta-analysis. Genomic sequencing of 528 samples collected in Ibaraki showed 481 (91%) samples were BA.5, 40 were BA.2, and 7 were BA.1 subvariants. MMWR Morb Mortal Wkly Rep. Jan 28 2022;71(4):125-131. doi:10.15585/mmwr.mm7104e1, Cavanaugh AM, Spicer KB, Thoroughman D, Glick C, Winter K. Reduced Risk of Reinfection with SARS-CoV-2 After COVID-19 Vaccination - Kentucky, May-June 2021. The mean and median incubation periods are usually the quick answers, but its also important to know the shape of the curve to understand how many outliers there are and for how long the period is, Stanley H. Weiss, MD, professor of medicine at the Rutgers New Jersey Medical School and professor of biostatistics and epidemiology at the Rutgers School of Public Health, told Verywell. Clin Infect Dis. Aug 24 2022;75(1):e741-e748. Booster doses are especially urgent for those at higher risk of severe disease, such as persons residing in nursing homes and long-term care facilities. Jul 2021;6:100109. doi:10.1016/j.lanepe.2021.100109, Kim L, Garg S, O'Halloran A, et al. doi:10.1136/bmj-2021-068632, Embi PJ, Levy ME, Naleway AL, et al. . Journal of Infection. We take your privacy seriously. SARS-CoV-2 Incubation Period during the Omicron BA.5-Dominant Period in Japan On This Page The Study. Effectiveness of Pfizer-BioNTech and Moderna Vaccines Against COVID-19 Among Hospitalized Adults Aged >/=65 Years - United States, January-March 2021. Am J Emerg Med. This system obtains genomic surveillance data from 1) National SARS-CoV-2 Strain Surveillance, 2) CDC-supported contracts with several commercial diagnostic laboratories, and 3) public repositories (the Global Initiative on Sharing Avian Influenza Data [GISAID] and the National Center for Biotechnology Information [NCBI]) of randomly sampled viruses with metadata tagging of sequences by various partners. Post-COVID-19 Symptoms and Conditions Among Children and Adolescents - United States, March 1, 2020-January 31, 2022. MMWR Morb Mortal Wkly Rep. Feb 4 2022;71(5):177-181. doi:10.15585/mmwr.mm7105e1, Olson SM, Newhams MM, Halasa NB, et al. Journal of investigative medicine : the official publication of the American Federation for Clinical Research. JAMA Intern Med. MMWR Morb Mortal Wkly Rep. Nov 26 2021;70(47):1640-1645. doi:10.15585/mmwr.mm7047e1, Hcini N, Maamri F, Picone O, et al. Sep 13 2022;226(5):797-807. doi:10.1093/infdis/jiac118, Parker EPK, Desai S, Marti M, et al. Implementation of concurrent prevention strategies, including vaccination, masking, improving ventilation, testing, quarantine, and isolation are recommended to slow transmission of SARS-CoV-2, including variants such as Omicron, to protect against severe illness and death from COVID-19. Under . CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Thank you for taking the time to confirm your preferences. These cookies may also be used for advertising purposes by these third parties. doi:10.1136/bmj.n1098, Antonelli M, Pujol JC, Spector TD, Ourselin S, Steves CJ. The first U.S. case of COVID-19 attributed to the Omicron variant was identified on December 1. Risk Factors for COVID-19-associated hospitalization: COVID-19-Associated Hospitalization Surveillance Network and Behavioral Risk Factor Surveillance System. 241(d); 5 U.S.C. Clinical Characteristics of Multisystem Inflammatory Syndrome in Adults: A Systematic Review. The incubation period in this study for patients during the BA.5dominant period was markedly shorter than that for patients during the Delta-dominant period; this result is supported by those from previous studies (10,11). 2023;29(3):595-598. https://doi.org/10.3201/eid2903.221360. Through this program, international air travelers are offered molecular testing of pooled samples collected upon arrival and a take-home collection kit (saliva collection for nucleic acid amplification test) to be used 35 days after arrival with subsequent sequencing of SARS-CoV-2positive specimens; persons in pools with a positive test result are contacted and advised to get retested using the home collection kit or another method. May 1 2022;41(5):424-426. doi:10.1097/inf.0000000000003502, Pellegrino R, Chiappini E, Licari A, Galli L, Marseglia GL. What are the implications for public health practice? Multisystem inflammatory syndrome in adults (MIS-A): case finding through systematic review of electronic medical records. You will be subject to the destination website's privacy policy when you follow the link. doi:10.1097/inf.0000000000003328, Kompaniyets L, Bull-Otterson L, Boehmer TK, et al. Hospitalizations Associated with COVID-19 Among Children and Adolescents - COVID-NET, 14 States, March 1, 2020-August 14, 2021. TaqPath COVID-19 Multiplex Diagnostic Solution. Clin Infect Dis. Response to additional COVID-19 vaccine doses in people who are immunocompromised: a rapid review. Waltham, MA: ThermoFisher Scientific; 2021. Omicrons incubation period is about two to four days, which is generally shorter than the previous variants. A partially vaccinated person had received a COVID-19 vaccine but not completed the primary series 14 days before illness onset or receipt of a positive SARS-CoV-2 test result. MMWR Morb Mortal Wkly Rep. Aug 13 2021;70(32):1081-1083. doi:10.15585/mmwr.mm7032e1, National Center for Immunization and Respiratory Diseases (NCIRD), Post-COVID Conditions: Healthcare Providers, Decontamination & Reuse of N95 Respirators, Purchasing N95 Respirators from Another Country, Powered Air Purifying Respirators (PAPRs), U.S. Department of Health & Human Services. COVID-19 Imaging: What We Know Now and What Remains Unknown. Classification of Omicron (B.1.1.529): SARS-CoV-2 variant of concern. 2021;21(1):1762. doi:10.1186/s12889-021-11761-1. We defined patients in the Delta-dominant period as those who had symptom onset during July 23September 14, 2021, and either they or their contacts were confirmed to have L452R-positive SARS-CoV-2. Early research indicates that the newer versions may be more transmissible and more . Epidemiologists believe Omicron has a shorter incubation period than the original variant, around 2 to 3 days. Trends in Treatments for Multisystem Inflammatory Syndrome in Children (MIS-C), United States, February 2020 - July 2021. Comparison of Blood Counts and Markers of Inflammation and Coagulation in Patients With and Without COVID-19 Presenting to the Emergency Department in Seattle, WA. The Altmetric Attention Score for a research output provides an indicator of the amount of attention that it has received. Omicron has numerous mutations with potential to increase transmissibility, confer resistance to therapeutics, or partially escape infection- or vaccine-induced immunity (2). Clinical Imaging. Table 2. MMWR Morb Mortal Wkly Rep. Jul 17 2020;69(28):923-929. doi:10.15585/mmwr.mm6928e1, Yang X, Zhang J, Chen S, et al. Jan 18 2022;327(3):281-283. doi:10.1001/jama.2021.23262, Nygaard U, Holm M, Hartling UB, et al. Carla M. Delgado is a health and culture writer based in the Philippines. MMWR Morb Mortal Wkly Rep. Dec 31 2021;70(5152):1782-1784. doi:10.15585/mmwr.mm705152e3, Song JS, Lee J, Kim M, et al. Muscle or body aches. Persons aged 18 years who completed a primary mRNA COVID-19 vaccination series 6 months previously or who received an initial Janssen (Johnson & Johnson) vaccine dose 2 months previously should receive a booster dose; persons aged 1617 years are eligible to receive a Pfizer-BioNTech COVID-19 booster dose >6 months after completion of the primary series. doi:10.1016/j.cmi.2021.07.030, Abu-Raddad LJ, Chemaitelly H, Bertollini R, National Study Group for C-E. Severity of SARS-CoV-2 Reinfections as Compared with Primary Infections. The CDC released early information on 43 cases attributed to omicron in the U.S. from Dec. 1 to 8, saying 34 of those individuals were fully vaccinated, including 14 who had gotten a booster dose . N Engl J Med. People can experience asymptomatic SARS-CoV-2 infection, including people who are up to date with their vaccinesand people who were previously infected. The best way to protect yourself and those around you is to get vaccinated, Oller said. BMJ. When we fitted incubation period data from the BA.5dominant period to parametric distribution models, the Akaike information criterion for gamma distribution was smaller than that for Gaussian, lognormal, and Weibull distribution models. At the moment, there arent enough data to say for sure whether vaccination shortens the incubation period. Jul 16 2020;doi:10.1093/cid/ciaa1012, Kompaniyets L, Pennington AF, Goodman AB, et al. The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website. With the original COVID-19 variant, symptoms showed up on average around five to six days after contact with an infected person, [while] the Delta variants incubation period was around four days, Beth Oller, MD, a family physician at Solomon Valley Family Medicine, told Verywell. Pregnancy and postpartum outcomes in a universally tested population for SARS-CoV-2 in New York City: a prospective cohort study. Jan 27 2022;73:81-93. doi:10.1146/annurev-med-042220-014817, Bhaskaran K, Bacon S, Evans SJ, et al. Feb 10 2022;386(6):509-520. doi:10.1056/NEJMoa2116044, Sjoding MW, Dickson RP, Iwashyna TJ, Gay SE, Valley TS. A shorter incubation suggests a shorter quarantine period for BA.5 than for other variants. The omicron variant may spread faster and have a shorter incubation period, but that doesn't mean tests aren't effective means of detecting it. J Ophthalmic Vis Res. That change was announced in late December, before the height of the omicron peak in the U.S. 2021;325(11):1074. doi:10.1001/jama.2021.2091, Wanga V, Gerdes ME, Shi DS, et al. (5) Some people with COVID-19 have gastrointestinal symptoms such as nausea, vomiting, or diarrhea, sometimes prior to having fever or lower respiratory tract signs and symptoms. according to reports from the CDC. Mar 2021;82(3):329-338. doi:10.1016/j.jinf.2021.01.022, Di Fusco M, Lin J, Vaghela S, et al. Clin Infect Dis. A new variant of SARS-CoV-2 (the virus that causes COVID-19), B.1.1.529 (Omicron) (1), was first reported to the World Health Organization (WHO) by South Africa on November 24, 2021. Investigation of a SARS-CoV-2 B.1.1.529 (Omicron) Variant Cluster - Nebraska, November-December 2021. provided as a service to MMWR readers and do not constitute or imply COVID Incubation Period Has Changed and Chicago's Top Doc Says That's 'Good News' During her Facebook Live last week, Chicago Department of Public Health Commissioner Dr. Allison Arwady. Apr 19 2021;193(16):E540-e548. Accessed December 3, 2021. Expert Rev Vaccines. The American Journal of Emergency Medicine. Jul 1 2021;18:E66. 45 C.F.R. Fatigue. Sect. CDC COVID-19 Response Team (View author affiliations). Bmj. Fatigue. 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. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. (CDC) shows the seven-day moving average of covid-19 cases was 26,106 as of April 1, ever so slightly lower than 26,309 from a week earlier. Clin Infect Dis. MMWR Morb Mortal Wkly Rep. Sep 10 2021;70(36):1255-1260. doi:10.15585/mmwr.mm7036e2, Siegel DA, Reses HE, Cool AJ, et al. 2021/11/01/ 2021;27(11):1658-1665. doi:https://doi.org/10.1016/j.cmi.2021.05.040, Chandler CM, Reid MC, Cherian S, Sabath DE, Edlefsen KL. Atlanta, GA: US Department of Health and Human Services, CDC; 2021. The pre-Omicron incubation period for COVID-19 had been estimated to range from 2 to 14 days, with a median of 4-7 days from . Nov 2020;2(4):100246. doi:10.1016/j.ajogmf.2020.100246, Galang RR, Newton SM, Woodworth KR, et al. Clin Infect Dis. (8) Multiple publications have reported cases of people with abnormalities on chest imaging that are consistent with COVID-19 very early in the course of illness, even before the onset of symptoms or a positive COVID-19 test. Older adults may present with different symptoms than children and younger adults. Delta's incubation period was about four days, . For the most recent updates on COVID-19, visit our coronavirus news page. 552a; 44 U.S.C. days (95% CI). The average incubation period tends to differ among COVID-19 variants, and data suggest that it may be shorter for Omicron. Risk of clinical sequelae after the acute phase of SARS-CoV-2 infection: retrospective cohort study. doi:10.1016/S2214-109X(21)00593-3, Belay ED, Abrams J, Oster ME, et al. Lancet Infect Dis. Moreover, it is still necessary to wear a well-fitting mask and stay away from other people as much as possible for about five days after leaving isolation, experts said.

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