omicron incubation period cdc

Effect of Covid-19 Vaccination on Transmission of Alpha and Delta Variants. OToole , Scher E, Underwood A, et al. Nasal congestion. CDC is not responsible for the content Asymptomatic patients as a source of COVID-19 infections: A systematic review and meta-analysis. Emerg Infect Dis. Gronvall said when people are infectious, a rapid . Community and close contact exposures associated with COVID-19 among symptomatic adults. Incubation period of COVID-19 caused by unique SARS-CoV-2 strains: a systematic review and meta-analysis. Will Omicron Show Up On Rapid COVID Tests? Users guide to variant detection calculators. An update on COVID-19 and pregnancy. Downloads RIS [TXT - 2 KB] . Global Impact of Coronavirus Disease 2019 Infection Requiring Admission to the ICU: A Systematic Review and Meta-analysis. Finally, increasing patient numbers might have influenced the quality of contact tracing by the PHC. 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. We defined patients in the BA.1dominant period as those who had symptom onset during January 1February 2, 2022. May 2020;38(5):925-928. doi:10.1016/j.ajem.2019.07.020, Iuliano AD, Brunkard JM, Boehmer TK, et al. The utility of iPhone oximetry apps: A comparison with standard pulse oximetry measurement in the emergency department. . This prioritization should be balanced with maintaining case investigation and contact tracing for outbreaks of confirmed cases of SARS-CoV-2 infection in high-risk congregate settings (e.g., long-term care facilities, correctional facilities, and homeless shelters) and for persons at increased risk for severe COVID-19related health outcomes. SARS-CoV-2 setting-specific transmission rates: a systematic review and meta-analysis. doi:10.1093/cid/ciab1007, Miller AD, Yousaf AR, Bornstein E, et al. Third, exposures from sources other than the infector of the pair might have been missed. Multisystem Inflammatory Syndrome in Adults After Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infection and Coronavirus Disease 2019 (COVID-19) Vaccination. 2022;386(8):744-756. doi:10.1056/NEJMoa2116597, Lansbury L, Lim B, Baskaran V, Lim WS. Preprint posted onlineFebruary 2, 2022. doi:10.1101/2022.02.01.22269931, Liu X, Wang L, Ma X, Wang J, Wu L. Modeling the effect of age on quantiles of the incubation period distribution of COVID-19. 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. For example, masks are required in indoor areas on public transportation conveyances traveling into, within, or out of the United States, and on the indoor premises of U.S. transportation hubs. Current travel requirements and recommendations,**** surveillance programs, and efforts to educate travelers are intended to reduce COVID-19 transmission and support safer global travel. As of December 8, cases had been reported from across the country; 22 states have reported at least one case (Arizona, California, Colorado, Connecticut, Florida, Georgia, Hawaii, Illinois, Louisiana, Maryland, Massachusetts, Minnesota, Mississippi, Missouri, Nebraska, New Jersey, New York, Pennsylvania, Texas, Utah, Washington, and Wisconsin) (Figure). Response to additional COVID-19 vaccine doses in people who are immunocompromised: a rapid review. Lancet Respir Med. Centers for Disease Control and Prevention. CDC has a multifaceted surveillance system for analyzing SARS-CoV-2 variants circulating in the United States. Risk Factors for Severe COVID-19 in Children. 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. What Is the Incubation Period for the Flu This Year? Serial Intervals and Household Transmission of SARS-CoV-2 Omicron Variant, South Korea, 2021. We defined patients in the Omicron BA.5dominant period as those who had symptoms during July 4August 19, 2022. 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. The CDC indicated the infections took 33 to 75 hours, a median of about three days to show symptoms after exposure. Characteristics and Clinical Outcomes of Children and Adolescents Aged <18 Years Hospitalized with COVID-19 - Six Hospitals, United States, July-August 2021. SARS-CoV-2 Incubation Period during the Omicron BA.5Dominant Period in Japan. If the pair shared meals on both July 4 and 5, we excluded all data from this pair. The incubation period is the period from when a person becomes infected to when they start showing symptoms. Risk for Stillbirth Among Women With and Without COVID-19 at Delivery Hospitalization - United States, March 2020-September 2021. 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. Feb 17 2022;386(7):698-700. doi:10.1056/NEJMc2119236, Leon TM, Dorabawila V, Nelson L, et al. Comment submitted successfully, thank you for your feedback. MMWR and Morbidity and Mortality Weekly Report are service marks of the U.S. Department of Health and Human Services. Clinical Microbiology and Infection. But some scientists who've studied Omicron and. According to the Australian Department of Health, the incubation period for COVID-19 can range between one and 14 days, with most cases displaying symptoms by day 5 or 6 after exposure. References to non-CDC sites on the Internet are Jan 2022;22(1):306-314. doi:10.1111/ajt.16641, Tenforde MW, Patel MM, Gaglani M, et al. 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. * International travel within 14 days of symptom onset or, if asymptomatic, first positive SARS-CoV-2 test result. What is the incubation period of Omicron BA.2? Nebraska Cases of Omicron Suggest Short Incubation Period and Possibly Milder Disease. Co-infections in people with COVID-19: a systematic review and meta-analysis. Acute and Persistent Symptoms in Children With Polymerase Chain Reaction (PCR)-Confirmed Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infection Compared With Test-Negative Children in England: Active, Prospective, National Surveillance. 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 . 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. All information these cookies collect is aggregated and therefore anonymous. The incubation period is the time from exposure to a pathogen like a virus to the time of first . MMWR Morb Mortal Wkly Rep. Jul 3 2020;69(26):841-846. doi:10.15585/mmwr.mm6926e3, Clifford CT, Pour TR, Freeman R, et al. Aug 2021;69(6):1253-1255. doi:10.1136/jim-2021-001853, Roskosky M, Borah BF, DeJonge PM, et al. Characteristics of Adult Outpatients and Inpatients with COVID-19 - 11 Academic Medical Centers, United States, March-May 2020. N Engl J Med. For the week ending December 4, the Delta variant accounted for >99.9% of circulating SARS-CoV-2 variants. Nature medicine. Current trends and geographical differences in therapeutic profile and outcomes of COVID-19 among pregnant women - a systematic review and meta-analysis. 2022;5(2):e2143151. A 2021 study published in BMC Public Health found that the incubation period of the virus may vary by age. By clicking Accept All Cookies, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. An infected person can transmit of SARS-CoV-2 before the onset of symptoms. Congestion or runny nose. 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. The mean incubation period was 2.5 days for patients infected during shared meals, 2.9 days for patients without transmission during shared meals, 3.0 days for patients with infectors who were <19 years of age, and 2.5 days for patients with infectors who were >20 years of age (2.6 days for 79 patients with infectors who were 2059 years of age and 2.1 days for 16 patients with infectors who were >60 years of age). Classification of Omicron (B.1.1.529): SARS-CoV-2 variant of concern. Sep 30 2022;75(7):1201-1209. doi:10.1093/cid/ciac072, Zambrano LD, Newhams MM, Olson SM, et al. doi:10.1148/radiol.2021204522, Doerschug KC, Schmidt GA. doi:10.1093/cid/ciab991, Davis HE, Assaf GS, McCorkell L, et al. European Journal of Pediatrics. We calculated the incubation period by using the calendar dates of contact and symptom onset, regardless of duration or number of contacts. CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Underlying Medical Conditions Associated With Severe COVID-19 Illness Among Children. Shortness of breath or difficulty breathing. Trends in Disease Severity and Health Care Utilization During the Early Omicron Variant Period Compared with Previous SARS-CoV-2 High Transmission Periods - United States, December 2020-January 2022. Feb 2021;257:11-18. doi:10.1016/j.ejogrb.2020.11.068, Prabhu M, Cagino K, Matthews KC, et al. In part, I think [the incubation period] strongly depends upon the infected human.. 552a; 44 U.S.C. If You Have COVID-19, Is It Really Safe to Only Isolate for 5 Days? Although there is a shorter incubation period, you still need to test regularly if youve been exposed. The clinical severity of infection with the Omicron variant will become better understood as additional cases are identified and investigated. N Engl J Med. Centers for Disease Control and Prevention. Omicron has numerous mutations with potential to increase transmissibility, confer resistance to therapeutics, or partially escape infection- or vaccine-induced immunity (2). The Lancet Haematology. Risk of long COVID associated with delta versus omicron variants of SARS-CoV-2. In September 2021, a systematic review of all MIS-A publications reported a total of 221 cases, with a median age of 21 years and 70% of the cases being male. Saving Lives, Protecting People. Sect. 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. Fatigue. Given the 23 weeks from the time of specimen collection to availability of sequence data for analysis, it is likely that additional infections with Omicron from late November will be detected during the coming days. However, there was a range: Some . Jan 27 2022;73:81-93. doi:10.1146/annurev-med-042220-014817, Bhaskaran K, Bacon S, Evans SJ, et al. Tables Table 1. days (95% CI). The Lancet Regional Health - Europe. Mar 2021;82(3):329-338. doi:10.1016/j.jinf.2021.01.022, Di Fusco M, Lin J, Vaghela S, et al. Virus Evol 2021;7:veab064. doi:10.1016/S2214-109X(21)00593-3, Belay ED, Abrams J, Oster ME, et al. Reports on incubation periods for BA.5 are sparse. Risk Factors for COVID-19-associated hospitalization: COVID-19-Associated Hospitalization Surveillance Network and Behavioral Risk Factor Surveillance System. Clinical Characteristics and Outcomes of Hospitalized Women Giving Birth With and Without COVID-19. 2021:2021.02.27.21252169. doi:10.1101/2021.02.27.21252169, Jering KS, Claggett BL, Cunningham JW, et al. Nov 2020;127(12):1548-1556. doi:10.1111/1471-0528.16403, Siebach MK, Piedimonte G, Ley SH. Clinical manifestations, risk factors, and maternal and perinatal outcomes of coronavirus disease 2019 in pregnancy: living systematic review and meta-analysis. Efficacy of covid-19 vaccines in immunocompromised patients: systematic review and meta-analysis. No potential conflicts of interest were disclosed. Atlanta, GA: US Department of Health and Human Services, CDC; 2021. Because symptoms may progress quickly, close follow-up is needed, especially for older adults, people with disabilities, people with immunocompromising conditions, and people with medical conditions that place them at greater risk for severe illness or death. Symptoms can change over the course of illness and can progress in severity. BNT162b2 mRNA Vaccination Against COVID-19 is Associated with Decreased Likelihood of Multisystem Inflammatory Syndrome in U.S. Children Ages 5-18 Years. COVID-19 in Immunocompromised Hosts: What We Know So Far. Department of Health and Human Services. 2022:o110. American Journal of Clinical Pathology. Characteristics, Outcomes, and Severity Risk Factors Associated With SARS-CoV-2 Infection Among Children in the US National COVID Cohort Collaborative. 2022/09/15 2022;doi:10.1007/s00431-022-04600-x, Zimmermann P, Pittet LF, Curtis N. How Common is Long COVID in Children and Adolescents? 2020/06/01/ 2020;7(6):e438-e440. A small study from CDC also . In adults, age is the strongest risk factor for severe COVID-19. Oct 1 2021;4(10):e2128568. Questions or messages regarding errors in formatting should be addressed to Fourth, the incubation period was calculated by the calendar date and not by real-time intervals. During the past several years, CDC has intensified efforts to significantly expand genomic sequencing capacity at the federal and state levels. According to the CDC, the following are symptoms of a COVID infection: Fever or chills Cough Shortness of breath or difficulty breathing Fatigue Muscle or body aches Headache New loss of taste or. 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. The method is based on rapid screening for S-gene target failures (SGTFs) by polymerase chain reaction (PCR)based diagnostic assays to flag potential cases of Omicron variant infection for confirmation by genomic sequencing (5). MMWR Morb Mortal Wkly Rep. Mar 4 2022;71(9):335-340. doi:10.15585/mmwr.mm7109a2, Burki TK. Maternal, fetal and neonatal outcomes of large series of SARS-CoV-2 positive pregnancies in peripartum period: A single-center prospective comparative study. Jun 18 2022;399(10343):2263-2264. doi:10.1016/S0140-6736(22)00941-2, Notarte KI, Catahay JA, Velasco JV, et al. Symptoms can overlap with those of other viral respiratory illnesses. "What we've seen with omicron compared to the previous incubation time -- which is seven days between time exposed to . The CDC states that anyone who may have been exposed to someone with . Long-Term Symptoms Among Adults Tested for SARS-CoV-2 - United States, January 2020-April 2021. The Omicron variant has an incubation period of about three days, which is shorter than the incubation period for other variants of the virus that cause COVID-19. the date of publication. doi:10.1093/ofid/ofab428, Rader B.; Gertz AL, D.; Gilmer, M.; Wronski, L.; Astley, C.; Sewalk, K.; Varrelman, T.; Cohen, J.; Parikh, R.; Reese, H.; Reed, C.; Brownstein J. JAMA Network Open. 2022;6(5):294-302. doi:10.1016/s2352-4642(22)00027-x, Torjesen I. Covid-19: Omicron variant is linked to steep rise in hospital admissions of very young children. Incubation period correlated with shared meals and adult infectors. 2021;56(6):1342-1356. doi:10.1002/ppul.25344, Rubens JH, Akindele NP, Tschudy MM, Sick-Samuels AC. Nov 2022;53:101624. doi:10.1016/j.eclinm.2022.101624, Tenforde MW, Olson SM, Self WH, et al. Clin Infect Dis. 2023;29(3):595-598. https://doi.org/10.3201/eid2903.221360. Prevalence and clinical presentation of long COVID in children: a systematic review. SARS-CoV-2 Incubation Period during the Omicron BA.5-Dominant Period in Japan On This Page The Study. The omicron variant may create mild COVID-19 symptoms and reinfect previously infected COVID-19 patients, but it could have a shorter incubation time than previous COVID-19 strains, according to a new Centers for Disease Control and Prevention report.. CDC investigates omicron variant spread. Even if most infections are mild, a highly transmissible variant could result in enough cases to overwhelm health systems. Interim clinical guidance for management of patients with confirmed coronavirus disease (COVID-19). During the Delta-dominant period, the mean incubation period was 3.7 (3.44.0) days, and the median was 3.5 (3.23.8) days. Mutations in Omicron might increase transmissibility, confer resistance to therapeutics, or partially escape infection- or vaccine-induced immunity. Accessed December 3, 2021. (11), Less common presentations of COVID-19 can occur. 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. Cookies used to make website functionality more relevant to you. Scientists around the world are working to rapidly learn more about the Omicron variant to better understand how easily it might be transmitted and the effectiveness of current diagnostic tests, vaccines, and therapeutics against this variant. The mean during the BA.1dominant period was 2.9 (95% CI 2.63.2) days, and the median was 2.7 (95% CI 2.53.0) days. 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. Lancet Reg Health Eur. May 19 2021;373:n1098. 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). Among 43 cases with initial follow-up, one hospitalization and no deaths were reported. Accessed December 3, 2021. 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. Some older adults can experience COVID-19 infection accompanied by delirium, falls, reduced mobility or generalized weakness, and glycemic changes. 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. Aug 2020;25(32)doi:10.2807/1560-7917.Es.2020.25.32.2001483, Eyre DW, Taylor D, Purver M, et al. COVID-19 Response Team. Association between COVID-19 diagnosis and presenting chief complaint from New York City triage data. Estimating the duration of infectiousness is more challenging than measuring incubation periods; one study that measured viral load of Omicron suggested that viral load had diminished by days 10-13, which is in line with our findings ( 6 ). A recent study from the Centers for Disease Control and Prevention (CDC) analyzed data from six people who contracted the Omicron variant of SARS-CoV-2, the virus that causes COVID-19, and found that 73 hours (or three days) was the typical incubation period for patients. Johannesburg, South Africa: National Institute for Communicable Diseases; 2021. JAMA Pediatr. Impact of COVID-19 vaccination on the risk of developing long-COVID and on existing long-COVID symptoms: A systematic review. One vaccinated patient was hospitalized for 2 days, and no deaths have been reported to date. 2021;156(2):185-197. doi:10.1093/ajcp/aqab052, Levi M, Thachil J, Iba T, Levy JH. doi:10.1136/bmj.n385, Martin B, Dewitt PE, Russell S, et al. Frequency, Characteristics and Complications of COVID-19 in Hospitalized Infants. Distinguishing Multisystem Inflammatory Syndrome in Children From COVID-19, Kawasaki Disease and Toxic Shock Syndrome. Jan 15 2021;doi:10.1001/jamainternmed.2020.9241, Matar R, Alrahmani L, Monzer N, et al. 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. 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. 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). Coagulation abnormalities and thrombosis in patients with COVID-19. Incubation period correlated with shared meals and adult infectors. 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. 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. (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. The Journal of infection. The CDC says COVID-19 may cause the following symptoms: Fever or chills. Acute covid-19 and multisystem inflammatory syndrome in children. New England Journal of Medicine. Science brief: Omicron (B.1.1.529) variant. We performed multivariate gamma regression analyses; transmission during shared meals (p = 0.03) and age of infector (p = 0.007) correlated significantly with incubation period (Table 2). We fitted incubation period data for each subvariant to the gamma distribution model and calculated parameters and 95% CI within a Bayesian inference framework. 2021/02/01/ 2021;159(2):524-536. doi:https://doi.org/10.1016/j.chest.2020.10.014, Genovese G, Moltrasio C, Berti E, Marzano AV. These cookies may also be used for advertising purposes by these third parties. No hospitalizations or deaths were reported. 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. We estimated the monovariable mean incubation period of 122 patients during the BA.5dominant period. (16) Both people who have been vaccinated and those who have not been vaccinated can transmit virus. COVID-19 vaccine effectiveness among immunocompromised populations: a targeted literature review of real-world studies. Genomic surveillance is implemented in partnership with state and local public health laboratories, the Association of Public Health Laboratories, and other academic and government partners. As of the week ending December 4, the SARS-CoV-2 B.1.617.2 (Delta) variant was estimated to account for 99.9% of SARS-CoV-2 circulating in the United States. Am J Obstet Gynecol MFM. Clinical considerations for care of children and adults with confirmed COVID-19, Data suggest that incubation periods may differ by variant of the virus. 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CDC twenty four seven. 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. New loss of taste or smell. CDC. Am J Obstet Gynecol. COVID-19 in immunocompromised patients: A systematic review of cancer, hematopoietic cell and solid organ transplant patients. . On December 10, 2021, this report was posted online as an MMWR Early Release. Dec 23 2021;385(26):2487-2489. doi:10.1056/NEJMc2108120, Rossler A, Riepler L, Bante D, von Laer D, Kimpel J. SARS-CoV-2 Omicron Variant Neutralization in Serum from Vaccinated and Convalescent Persons. Hoarse voice. Nick Blackmer is a librarian, fact-checker, and researcher with more than 20 years experience in consumer-oriented health and wellness content. 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. 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. doi:10.1001/jamanetworkopen.2021.11182, Feldstein LR, Tenforde MW, Friedman KG, et al. Epidemiologists believe Omicron has a shorter incubation period than the original variant, around 2 to 3 days. A preprint study published in medRxiv found that many individuals with COVID-19 remain contagious after the fifth day of illnessregardless of symptom statuswhich means including individuals on their days six to 10 of illness in work settings may increase the spread of the virus. The mean (+SD) incubation periods were 2.6 (+1.0) days during the BA.5dominant period, 2.9 (+1.3) days during the BA.1dominant period, and 3.7 (+1.6) days during the Delta-dominant period. The information in this article is current as of the date listed, which means newer information may be available when you read this. 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. Jul 2021;6:100109. doi:10.1016/j.lanepe.2021.100109, Kim L, Garg S, O'Halloran A, et al. For purposes of entry into the United States, vaccines accepted will include FDA approved or authorized and WHO Emergency Use Listing vaccines. doi:http://dx.doi.org/10.15585/mmwr.mm7113e1, Pingali C, Meghani M, Razzaghi H, et al. doi:10.5888/pcd18.210123, Ko JY, Danielson ML, Town M, et al. CDC COVID-19 Response Team. Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data. 2022/02/01/ 2022;13:100278. doi:https://doi.org/10.1016/j.lanepe.2021.100278, Jansen L, Tegomoh B, Lange K, et al. Centers for Disease Control and Prevention. Centers for Disease Control and Prevention. 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. There are arguments that could be made both towards shortening or lengthening, Weiss said. Feb 24 2022;386(8):713-723. doi:10.1056/NEJMoa2117995, Price AM, Olson SM, Newhams MM, et al. 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.

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