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No hospitalizations or deaths were reported. 2020/06/01/ 2020;7(6):e438-e440. Runny nose. Early research indicates that the newer versions may be more transmissible and more . Am J Obstet Gynecol. 2023 Dotdash Media, Inc. All rights reserved, Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. Feb 17 2022;386(7):698-700. doi:10.1056/NEJMc2119236, Leon TM, Dorabawila V, Nelson L, et al. 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. 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. May 2022;28(5):986-989. doi:10.3201/eid2805.220166, Saelee R, Zell E, Murthy BP, et al. (3,4) Presentation CDC has developed a working case definition for MIS-A. CDC is not responsible for the content Jul 15 2021;73(Suppl 1):S5-S16. MMWR Morb Mortal Wkly Rep. April 1, 2022;71(13):489494. 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. 2021;4(9):e2126456-e2126456. On November 28, CDC expanded a voluntary airport-based genomic surveillance program in Atlanta, New York City, Newark, and San Francisco to prioritize recruitment of travelers from southern Africa for testing. May 1 2022;41(5):424-426. doi:10.1097/inf.0000000000003502, Pellegrino R, Chiappini E, Licari A, Galli L, Marseglia GL. Nov 2020;2(4):100246. doi:10.1016/j.ajogmf.2020.100246, Galang RR, Newton SM, Woodworth KR, et al. MMWR Morb Mortal Wkly Rep. Apr 3 2020;69(13):377-381. doi:10.15585/mmwr.mm6913e1, Sheehan MM, Reddy AJ, Rothberg MB. TaqPath COVID-19 Multiplex Diagnostic Solution. But it would help explain the variant's rapid spread. A number of measures have been implemented throughout the COVID-19 pandemic to reduce the introduction and spread of SARS-CoV-2 in the United States through travel. Austin, TX: University of Texas at Austin; 2021. Efficacy of covid-19 vaccines in immunocompromised patients: systematic review and meta-analysis. Jun 1 2021;4(6):e2111182. 2021;237(1):1-12. doi:10.1159/000512932, Thompson HA, Mousa A, Dighe A, et al. . Thank you for taking the time to confirm your preferences. You can review and change the way we collect information below. Oct 1 2021;4(10):e2128568. The four participating airports receive a large, diverse volume of international travelers, including direct flights from southern Africa. 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. Suggested Citation. Omicron has numerous mutations with potential to increase transmissibility, confer resistance to therapeutics, or partially escape infection- or vaccine-induced immunity (2). Mutations in Omicron might increase transmissibility, confer resistance to therapeutics, or partially escape infection- or vaccine-induced immunity. They help us to know which pages are the most and least popular and see how visitors move around the site. Health Care Utilization and Clinical Characteristics of Nonhospitalized Adults in an Integrated Health Care System 28-180 Days After COVID-19 Diagnosis - Georgia, May 2020-March 2021. COVID-19 Cases and Hospitalizations by COVID-19 Vaccination Status and Previous COVID-19 Diagnosis - California and New York, May-November 2021. Multisystem Inflammatory Syndrome in Children-United States, February 2020-July 2021. Trends in Treatments for Multisystem Inflammatory Syndrome in Children (MIS-C), United States, February 2020 - July 2021. Clinical considerations for care of children and adults with confirmed COVID-19, Data suggest that incubation periods may differ by variant of the virus. doi:http://dx.doi.org/10.15585/mmwr.mm7121e1, Sudre CH, Murray B, Varsavsky T, et al. By Carla Delgado 2022;5(2):e2143151. If you need to go back and make any changes, you can always do so by going to our Privacy Policy page. doi:10.1093/cid/ciac471, Godfred-Cato S, Abrams JY, Balachandran N, et al. We enrolled COVID-19 infector/infectee pairs who lived within the Itako PHC jurisdiction and had a single definite close contact date with patients who had COVID-19 without other potential transmission settings. The CDC indicated the infections took 33 to 75 hours, a median of about three days to show symptoms after exposure. (1) A study conducted during high levels of Delta variant transmission reported an incubation period of 4.3 days, (2) and studies performed during high levels of Omicron variant transmission reported a median incubation period of 3-4 days. Dec 2021;27(12):1860 e7-1860 e10. Epidemiologists believe Omicron has a shorter incubation period than the original variant, around 2 to 3 days. BMJ. SARS-CoV-2 setting-specific transmission rates: a systematic review and meta-analysis. Investigation of a SARS-CoV-2 B.1.1.529 (Omicron) Variant Cluster - Nebraska, November-December 2021. We calculated the incubation period by using the calendar dates of contact and symptom onset, regardless of duration or number of contacts. SARS-CoV-2 shedding dynamics across the respiratory tract, sex, and disease severity for adult and pediatric COVID-19. MMWR Morb Mortal Wkly Rep. Jan 28 2022;71(4):132-138. doi:10.15585/mmwr.mm7104e2, Danza P, Koo TH, Haddix M, et al. https://covid.cdc.gov/covid-data-tracker/#variant-proportions Top References CDC. Apr 1 2021;4(4):e215298. 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. Effectiveness of two-dose vaccination with mRNA COVID-19 vaccines against COVID-19-associated hospitalizations among immunocompromised adults-Nine States, January-September 2021. The CDC report also found that the incubation period for the omicron variant that is, the amount of time from when a person is infected to when symptoms begin appears to be shorter than . Headache. This is in part because Omicron is far better at circumventing the current vaccines than the Delta variant, . MMWR Morb Mortal Wkly Rep. Apr 30 2021;70(17):644-650. doi:10.15585/mmwr.mm7017e3, Chevinsky JR, Tao G, Lavery AM, et al. of pages found at these sites. What Is the Incubation Period for the Flu This Year? We estimated the monovariable mean incubation period of 122 patients during the BA.5dominant period. Frequently asked questions for the B.1.1.529 mutated SARS-CoV-2 lineage in South Africa. Aug 1 2021;175(8):837-845. doi:10.1001/jamapediatrics.2021.0630, Miller AD, Zambrano LD, Yousaf AR, et al. The number of confirmed COVID-19 cases from July 4 through August 19, 2022, was 12,577 in the PHCs jurisdiction, which has a population of 265,000 persons (5). CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. Risk of clinical sequelae after the acute phase of SARS-CoV-2 infection: retrospective cohort study. Centers for Disease Control and Prevention. Specimens that display SGTFs have a higher likelihood to be Omicron (although SGTFs are not unique to Omicron) based on a mutation (6970 deletion) that reduces S-gene target amplification in some PCR assays. Dermatology. More information is available, Recommendations for Fully Vaccinated People, people who are up to date with their vaccines, Clinical Progression, Management, and Treatment, Alene M, Yismaw L, Assemie MA, Ketema DB, Gietaneh W, Birhan TY. The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website. We defined patients in the Omicron BA.5dominant period as those who had symptoms during July 4August 19, 2022. Underlying Medical Conditions Associated With Severe COVID-19 Illness Among Children. The information in this article is current as of the date listed, which means newer information may be available when you read this. Mar 2 2022;376:e068632. Characteristics and Outcomes of US Children and Adolescents With Multisystem Inflammatory Syndrome in Children (MIS-C) Compared With Severe Acute COVID-19. 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. Coronavirus (COVID-19) Infection Survey Technical Article: Impact of vaccination on testing positive in the UK. Frequency, Characteristics and Complications of COVID-19 in Hospitalized Infants. Systematic review and meta-analysis of chest radiograph (CXR) findings in COVID-19. Preventing chronic disease. An infected person can transmit of SARS-CoV-2 before the onset of symptoms. According to the CDC, the incubation period for COVID is between two and 14 days, though the newest guidance from the agency suggests a quarantine of five days for those who are not boosted, but eligible or unvaccinated. Late Conditions Diagnosed 1-4 Months Following an Initial Coronavirus Disease 2019 (COVID-19) Encounter: A Matched-Cohort Study Using Inpatient and Outpatient Administrative Data-United States, 1 March-30 June 2020. Please use the form below to submit correspondence to the authors or contact them at the following address: Tsuyoshi Ogata, Itako Public Health Center of Ibaraki Prefectural Government, Osu1446-1, Itako, Ibaraki, 311-2422, Japan; e-mail: kenkoukikikanri@gmail.plala.or.jp. Anyone exhibiting symptoms should get tested for COVID-19. Delta's incubation period was about four days, . Risk Factors for COVID-19-associated hospitalization: COVID-19-Associated Hospitalization Surveillance Network and Behavioral Risk Factor Surveillance System. Short-term and Long-term Rates of Postacute Sequelae of SARS-CoV-2 Infection: A Systematic Review. Thank you, {{form.email}}, for signing up. Omicron seems to have a shorter incubation period compared with other variants; the CDC reports that symptoms show up about three days after transmission. Oct 3 2022;75(Supplement_2):S303-s307. Characteristics of the cases described in this report might also not be generalizable because case findings might be associated with individual characteristics (e.g., persons with recent international travel might be more likely to be younger and vaccinated). MMWR Morb Mortal Wkly Rep. May 27, 2022 71(21):713717. The role of antiviral treatment in the COVID-19 pandemic. Risk factors for illness severity among pregnant women with confirmed SARS-CoV-2 infection Surveillance for Emerging Threats to Mothers and Babies Network, 20 state, local, and territorial health departments, March 29, 2020 -January 8, 2021. medRxiv. Apr 2021;27(4):626-631. doi:10.1038/s41591-021-01292-y, Daugherty SE, Guo Y, Heath K, et al. National Institute for Communicable Diseases. 241(d); 5 U.S.C. . 2020/08/01/ 2020;81(2):266-275. doi:https://doi.org/10.1016/j.jinf.2020.05.046, Gerver SM, Guy R, Wilson K, et al. Mar 11 2021;21(1):257. doi:10.1186/s12879-021-05950-x, Grant R, Charmet T, Schaeffer L, et al. doi:10.1136/bmj.n385, Martin B, Dewitt PE, Russell S, et al. These cookies may also be used for advertising purposes by these third parties. According to Japans Infectious Diseases Control Law, public health centers (PHCs) must be notified of all COVID-19 cases and conduct contact tracing (4). To accelerate detection of COVID-19 cases attributed to the Omicron variant until they are common enough to be reliably measured by routine genomic surveillance, enhanced surveillance was initiated through National SARS-CoV-2 Strain Surveillance on November 28. SARS-CoV-2 in pregnancy: characteristics and outcomes of hospitalized and non-hospitalized women due to COVID-19. The incubation period is the time from exposure to a pathogen like a virus to the time of first . Jul 2022;6(7):459-465. doi:10.1016/s2352-4642(22)00100-6, Belay ED, Godfred Cato S, Rao AK, et al. In December, the CDC issued new guidance reducing the isolation period of infected individuals to five days, if their symptoms have fully resolved. Hospitalizations Associated with COVID-19 Among Children and Adolescents - COVID-NET, 14 States, March 1, 2020-August 14, 2021. (1) A study conducted during high levels of Delta variant transmission reported an incubation period of 4.3 days,(2) and studies performed during high levels of Omicron variant transmission reported a median incubation period of 34 days.(3,4). Feb 2021;257:11-18. doi:10.1016/j.ejogrb.2020.11.068, Prabhu M, Cagino K, Matthews KC, et al. Characteristics, Outcomes, and Severity Risk Factors Associated With SARS-CoV-2 Infection Among Children in the US National COVID Cohort Collaborative. 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. Lancet. Radiology. They help us to know which pages are the most and least popular and see how visitors move around the site. The clinical presentation of COVID-19 ranges from asymptomatic to critical illness. While long COVID, hospitalization, or death is less likely if a person is vaccinated, it is still possible and is not a risk that most of us want to take. 2021:2021.02.27.21252169. doi:10.1101/2021.02.27.21252169, Jering KS, Claggett BL, Cunningham JW, et al. After 10 days, you can consider yourself good to go, says Chin-Hong. doi:10.1001/jamanetworkopen.2021.26456, Melgar M, Haston J, DeCuir J, et al. JAMA Netw Open. An unvaccinated person had received no COVID-19 vaccine. Researchers say it's too early to know whether that shorter incubation period for omicron translates into earlier contagiousness. A study of a small cluster of COVID-19 cases in Nebraska involving Omicron indicates that it may take as little as three days for infected people to develop symptoms, referring to the new variant's incubation period, according to the research published this week by the U.S. Centers for Disease Control and . (14) Some skin manifestations may be associated with increased disease severity. Nasal congestion. Jul 1 2021;18:E66. *** To date, at least one confirmed case attributed to the Omicron variant has been identified in the United States through these aircraft contact investigation efforts. Characteristics and Disease Severity of US Children and Adolescents Diagnosed With COVID-19. The first patient infected with SARS-CoV-2 Omicron BA.5 was reported on July 4, 2022, to the Itako PHC in Ibaraki Prefecture, Japan. MMWR Morb Mortal Wkly Rep. Aug 5 2022;71(31):993-999. doi:10.15585/mmwr.mm7131a3, Zavala M, Ireland G, Amin-Chowdhury Z, Ramsay ME, Ladhani SN. 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. Incubation period correlated with shared meals and adult infectors. During December 18, 2021, 22 U.S. states reported at least one COVID-19 case attributed to the Omicron variant. 2021;21(1):1762. doi:10.1186/s12889-021-11761-1. A study of the Oslo Christmas party outbreak found the incubation period could be about three days, compared with 4.3 days for delta and five days for other variants. Prevalence of comorbidities and its effects in patients infected with SARS-CoV-2: a systematic review and meta-analysis. We must remember, however, that this is an average, and some people may have symptoms as early as two days or as late as 14 days after exposure.. Centers for Disease Control and Prevention. We thank the staff of the Itako Public Health Center, Ibaraki Prefectural Institute of Public Health, and government of Ibaraki Prefecture for their contributions to our study. Similar to previous variants, just because you dont have symptoms does not mean that you are not spreading the virus to other people. Heres what that means for infected individuals. 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. Accessed December 3, 2021. An early CDC study, released on Tuesday, examined an Omicron cluster in Nebraska and found that the time between exposure and infection - known as the incubation period - may be around three . EClinicalMedicine. The 95th percentile distribution for incubation period among patients during the BA.5dominant period appeared shorter than that during the BA.1dominant period, although the difference was not statistically significant. 2021/08/01/ 2021;46:520-524. doi:https://doi.org/10.1016/j.ajem.2020.11.006, Nasiri N, Sharifi H, Bazrafshan A, Noori A, Karamouzian M, Sharifi A. Ocular Manifestations of COVID-19: A Systematic Review and Meta-analysis. Aug 4 2022;doi:10.1093/cid/ciac637, Levy M, Recher M, Hubert H, et al. In part, I think [the incubation period] strongly depends upon the infected human.. Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data. Feb 2022;226(2):177-186. doi:10.1016/j.ajog.2021.08.054, Barbero P, Mugerza L, Herraiz I, et al. National surveillance of bacterial and fungal coinfection and secondary infection in COVID-19 patients in England: lessons from the first wave. Five pools collected November 30December 6, representing 59 travelers, had evidence of SGTF. This report summarizes U.S. surveillance for SARS-CoV-2 variants, characteristics of the initial persons investigated with COVID-19 attributed to the Omicron variant and public health measures implemented to slow the spread of Omicron in the United States. Reports on incubation periods for BA.5 are sparse. doi:10.1503/cmaj.202604, Allotey J, Stallings E, Bonet M, et al. CDC says the majority of virus transmission occurs one to two days before symptom onset and two to three days after. Underlying Medical Conditions and Severe Illness Among 540,667 Adults Hospitalized With COVID-19, March 2020-March 2021. part 56; 42 U.S.C. Sep 13 2022;226(5):797-807. doi:10.1093/infdis/jiac118, Parker EPK, Desai S, Marti M, et al. Fifth, the variant type was not confirmed by using genomic sequencing. Science brief: Omicron (B.1.1.529) variant. Read our. To receive email updates about COVID-19, enter your email address: We take your privacy seriously. Fatigue. Shorter incubation time for this variant suggests the quarantine period could be reduced. Some data suggest the incubation period for Omicron may be closer to three days.. Hospitalization of Infants and Children Aged 0-4 Years with Laboratory-Confirmed COVID-19 - COVID-NET, 14 States, March 2020-February 2022. Sep 2021;8(9):ofab428. Risk Factors for Severe COVID-19 in Children. Study: Newer COVID-19 Variants Have Shorter Incubation Periods. MMWR Morb Mortal Wkly Rep. Dec 31 2021;70(5152):1766-1772. doi:10.15585/mmwr.mm705152a3, Woodruff RC, Campbell AP, Taylor CA, et al. The decrease in isolation time was largely to decrease the impact and disruption of infection on day-to-day life and allow people to return to work sooner, Oller said. Ogata, T., & Tanaka, H. (2023). 2021;156(2):185-197. doi:10.1093/ajcp/aqab052, Levi M, Thachil J, Iba T, Levy JH. Effectiveness of BNT162b2 Vaccine against Critical Covid-19 in Adolescents. Omicrons average incubation period doesnt mean that people who dont get symptoms four days after exposure are not infected. J Ophthalmic Vis Res. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. Will Omicron Show Up On Rapid COVID Tests? Jan 27 2021;72(2):340-350. doi:10.1093/cid/ciaa863, Belsky JA, Tullius BP, Lamb MG, Sayegh R, Stanek JR, Auletta JJ. The Altmetric Attention Score for a research output provides an indicator of the amount of attention that it has received. Jan 2021;21(1):52-58. doi:10.1016/S1473-3099(20)30764-7, Wang J, Kaperak C, Sato T, Sakuraba A. COVID-19 reinfection: a rapid systematic review of case reports and case series. 3501 et seq. The Lancet Haematology. N Engl J Med. Sect. Skin Manifestations Associated with COVID-19: Current Knowledge and Future Perspectives. What is Omicron's incubation period? Specific symptom information was available from 37 symptomatic persons. Among the cases described in this report, the earliest report of symptom onset was November 15. Scientists in South Africa and elsewhere have established systems that allow study of the laboratory, clinical, and epidemiologic characteristics; CDC is collaborating with health officials around the world to learn more about the characteristics of patients with Omicron variant infections. World Health Organization. OToole , Scher E, Underwood A, et al. Omicron made up an estimated 73% of new coronavirus cases between Dec. 12 and Dec. 18, according to the CDC. 2022/02/01/ 2022;13:100278. doi:https://doi.org/10.1016/j.lanepe.2021.100278, Jansen L, Tegomoh B, Lange K, et al. Regarding the isolation period for COVID-19 generally, the CDC states that people must isolate for 10 days after symptoms first show up and can stop after that as long as they haven't had a. doi:http://dx.doi.org/10.15585/mmwr.mm7113e1, Pingali C, Meghani M, Razzaghi H, et al. Distinguishing Multisystem Inflammatory Syndrome in Children From COVID-19, Kawasaki Disease and Toxic Shock Syndrome. doi:10.1148/radiol.2021204522, Doerschug KC, Schmidt GA. This policy was intended to reduce overall travel volume from the region where Omicron was first identified to delay the introduction and spread of Omicron while U.S. public health measures were enhanced. "Omicron has the shortest incubation period. Sect. 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. Get vaccinated, encourage those you love to get vaccinated and get boosted when it is recommended.. Of secondary cases, 90% had an incubation period of 6 days for Omicron and 7 days for Delta. COVID19 in childhood: Transmission, clinical presentation, complications and risk factors. Multisystem Inflammatory Syndrome in Adults After Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infection and Coronavirus Disease 2019 (COVID-19) Vaccination. Interim clinical guidance for management of patients with confirmed coronavirus disease (COVID-19), What we know about quarantine and isolation, CDC updates and shortens recommended isolation and quarantine period for general population, High rates of rapid antigen test positivity after 5 days of isolation for COVID-19, Modeling the effect of age on quantiles of the incubation period distribution of COVID-19. . 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 . If a pair shared meals on July 4 and the infectee had COVID-19 symptoms on July 7, we calculated an incubation period of 3 days. New loss of taste or smell . according to reports from the CDC. There was an unexpected error. View data is from . Atlanta, GA: US Department of Health and Human Services, CDC; 2021. Current trends and geographical differences in therapeutic profile and outcomes of COVID-19 among pregnant women - a systematic review and meta-analysis. Clinical Presentation and Outcomes of Pregnant Women With Coronavirus Disease 2019: A Systematic Review and Meta-analysis. . Nausea or vomiting. This interagency group focuses on the rapid characterization of emerging variants and actively monitors their potential impact on critical SARS-CoV-2 countermeasures, including vaccines, therapeutics, and diagnostics. New England Journal of Medicine. N Engl J Med. Omicrons incubation period is about two to four days, which is generally shorter than the previous variants. Risk for Stillbirth Among Women With and Without COVID-19 at Delivery Hospitalization - United States, March 2020-September 2021. Shorter incubation period among COVID-19 cases with the BA.1 Omicron variant. Clin 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. Implementation of concurrent prevention strategies, including vaccination, masking, improving ventilation, testing, quarantine, and isolation, are recommended to slow transmission of SARS-CoV-2 and to protect against severe illness, hospitalization, and death from COVID-19. Department of Health and Human Services. But while it's taking less time to develop symptoms, for many people it is also taking less time to recover. Exposure in restaurants has been shown to increase COVID-19 infection risk (14). Third, exposures from sources other than the infector of the pair might have been missed. We take your privacy seriously. Disparities in COVID-19 Vaccination Coverage Between Urban and Rural Counties - United States, December 14, 2020-January 31, 2022. No potential conflicts of interest were disclosed. 2020/09/01/ 2020;98:180-186. doi:https://doi.org/10.1016/j.ijid.2020.06.052, Yang J, Zheng Y, Gou X, et al. All information these cookies collect is aggregated and therefore anonymous. 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.. The rapid emergence and worldwide detection of the SARS-CoV-2 Omicron variant underscores the importance of robust genomic surveillance systems and prompt information-sharing among global public health partners. The score is derived from an automated algorithm, and represents a weighted count of the amount of attention Altmetric picked up for a research output. JAMA Network Open. Pulmonary Aspects of COVID-19. More information is available, Travel requirements to enter the United States are changing, starting November 8, 2021. Timely case investigation and contact tracing can help ensure compliance with isolation and quarantine guidance and link persons with positive SARS-CoV-2 test results and their close contacts to testing and supportive services.