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Science brief: Omicron (B.1.1.529) variant. 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. Lancet. 552a; 44 U.S.C. Nebraska Cases of Omicron Suggest Short Incubation Period and Possibly Milder Disease. Update on Omicron - World Health Organization 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. 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. Paediatric hospitalisations due to COVID-19 during the first SARS-CoV-2 omicron (B.1.1.529) variant wave in South Africa: a multicentre observational study. Suggested citation for this article: . Genomic sequencing detected variants of concern in Japan from July 19September 13, 2001, as follows: 26,963 cases of B.1.617.2 (Delta), 15,009 cases of B.1.1.7 (Alpha), and 5 cases of other variants (9); the L452R mutation was found mostly in the Delta variant. doi:10.1097/inf.0000000000003435, Marks KJ, Whitaker M, Agathis NT, et al. Community and close contact exposures associated with COVID-19 among symptomatic adults. Pediatrics. Waltham, MA: ThermoFisher Scientific; 2021. MMWR Morb Mortal Wkly Rep. Mar 25 2022;71(12):466-473. doi:10.15585/mmwr.mm7112e2, Johnson AG, Amin AB, Ali AR, et al. A small study from CDC also . Overall, 21 (91%) of 23 interviewed attendees participated in the convention all 3 days. J Infect Dis. According to . Incubation period correlated with shared meals and adult infectors. . 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). Sect. doi:10.1093/cid/ciab991, Davis HE, Assaf GS, McCorkell L, 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. These cookies may also be used for advertising purposes by these third parties. A study of the group released on Tuesday by the Centers for Disease Control and Prevention suggested that Omicron may have a shorter incubation period than previous variants: about 72 hours. Epidemiologists believe Omicron has a shorter incubation period than the original variant, around 2 to 3 days. Austin, TX: University of Texas at Austin; 2021. Nasal congestion. Genomic evidence for reinfection with SARS-CoV-2: a case study. Omicron symptoms: What we know about illness caused by the new subvariants doi:10.1093/cid/ciab936, Patel P, DeCuir J, Abrams J, Campbell AP, Godfred-Cato S, Belay ED. Omicron incubation: Can COVID variant get you sick quicker? - Miami Herald 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. In adults, age is the strongest risk factor for severe COVID-19. part 56; 42 U.S.C. (11), Less common presentations of COVID-19 can occur. Jul 2021;6:100109. doi:10.1016/j.lanepe.2021.100109, Kim L, Garg S, O'Halloran A, et al. Frequency, Characteristics and Complications of COVID-19 in Hospitalized Infants. What Parents Need to Know About the Omicron Variant Anyone exhibiting symptoms should get tested for COVID-19. Here's how Omicron differs from previous variants | Fortune Reports on incubation periods for BA.5 are sparse. Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data. Researchers say it's too early to know whether that shorter incubation period for omicron translates into earlier contagiousness. Sore throat. 2021;156(2):185-197. doi:10.1093/ajcp/aqab052, Levi M, Thachil J, Iba T, Levy JH. An infected person can transmit of SARS-CoV-2 before the onset of symptoms. Omicron BA.5 variant | COVID-19 | UC Davis Health What Is the Incubation Period of Omicron, How Long Are You - Newsweek 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. BA.5 is a subvariant of the SARS-CoV-2 Omicron variant (1). CDC Warns Omicron Wave Is Coming: When It Could Peak in US CDC recommends prioritizing case investigation and contact tracing for confirmed COVID-19 cases attributed to the Omicron variant. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. Effectiveness of BNT162b2 Vaccine against Critical Covid-19 in Adolescents. Impact of COVID-19 vaccination on the risk of developing long-COVID and on existing long-COVID symptoms: A systematic review. Update: Characteristics of Symptomatic Women of Reproductive Age with Laboratory-Confirmed SARS-CoV-2 Infection by Pregnancy Status - United States, January 22-October 3, 2020. MMWR Morb Mortal Wkly Rep. Apr 3 2020;69(13):377-381. doi:10.15585/mmwr.mm6913e1, Sheehan MM, Reddy AJ, Rothberg MB. After 10 days, you can consider yourself good to go, says Chin-Hong. However . 2 "BA.2 is a sub-variant of Omicron, which means it is likely that it has a shorter incubation period as well," Oller said. The earliest date of symptom onset was November 15 in a person with a history of international travel. Multisystem Inflammatory Syndrome in Adults After Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infection and Coronavirus Disease 2019 (COVID-19) Vaccination. These cookies may also be used for advertising purposes by these third parties. Risk for Stillbirth Among Women With and Without COVID-19 at Delivery Hospitalization - United States, March 2020-September 2021. Jan 2022;22(1):306-314. doi:10.1111/ajt.16641, Tenforde MW, Patel MM, Gaglani M, et al. 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. People can experience asymptomatic SARS-CoV-2 infection, including people who are up to date with their vaccinesand people who were previously infected. SARS-CoV-2 setting-specific transmission rates: a systematic review and meta-analysis. Under . Cookies used to make website functionality more relevant to you. For Immediate Release: Monday, December 27, 2021 Contact: Media Relations (404) 639-3286 Given what we currently know about COVID-19 and the Omicron variant, CDC is shortening the recommended time for isolation for the public. doi:https://doi.org/10.1016/S2352-3026(20)30145-9, Sadiq Z, Rana S, Mahfoud Z, Raoof A. Cookies used to make website functionality more relevant to you. How Does Omicron Compare to Previous Variants? MMWR Morb Mortal Wkly Rep. Apr 10 2020;69(14):416-418. doi:10.15585/mmwr.mm6914e2, Kimball A, Hatfield KM, Arons M, et al. Sep 30 2022;75(7):1201-1209. doi:10.1093/cid/ciac072, Zambrano LD, Newhams MM, Olson SM, et al. Dec 2021;27(12):1860 e7-1860 e10. In December, the CDC issued new guidance reducing the isolation period of infected individuals to five days, if their symptoms have fully resolved. Health and Human Services. Multistate Outbreak of SARS-CoV-2 B.1.1.529 (Omicron) 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. 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. Shortness of breath or difficulty breathing. When am I contagious if infected with omicron? - WTOP News Questions or messages regarding errors in formatting should be addressed to 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. 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 HTML versions of MMWR articles are generated from final proofs through an automated process. Compare this with Delta and other strains . *** 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. The Journal of infection. More information is available, Travel requirements to enter the United States are changing, starting November 8, 2021. Clin Infect Dis. JAMA. 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). "What we've seen with omicron compared to the previous incubation time -- which is seven days between time exposed to . CDC is also supporting efforts to prevent, detect, and respond to COVID-19 internationally, including through support for laboratory and sequencing capacity and strengthening global vaccine programs. (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). The Lancet Regional Health - Europe. Eur J Obstet Gynecol Reprod Biol. The incubation period was shorter among patients who had transmission occur during shared meals and those with adult infectors. Use of At-Home COVID-19 Tests United States, August 23, 2021March 12, 2022. Clinical manifestations, risk factors, and maternal and perinatal outcomes of coronavirus disease 2019 in pregnancy: living systematic review and meta-analysis. If You Have COVID-19, Is It Really Safe to Only Isolate for 5 Days? Table 1 - SARS-CoV-2 Incubation Period during the Omicron BA.5-Dominant Nov 2020;127(12):1548-1556. doi:10.1111/1471-0528.16403, Siebach MK, Piedimonte G, Ley SH. JAMA Netw Open. doi:10.1136/bmj.n385, Martin B, Dewitt PE, Russell S, et al. 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. Risk Factors for Severe COVID-19 in Children. 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. Anyone exhibiting symptoms should get tested for COVID-19. 2021;21(1):1762. doi:10.1186/s12889-021-11761-1. 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. Apr 20 2022;doi:10.1093/cid/ciac303, Hernandez-Romieu AC, Leung S, Mbanya A, et al. Clin Infect Dis. 2023;29(3):595-598. https://doi.org/10.3201/eid2903.221360. Tables Table 1. 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:10.1136/bmj.o110, Fung M, Babik JM. May 2022;28(5):986-989. doi:10.3201/eid2805.220166, Saelee R, Zell E, Murthy BP, et al. Furthermore, children usually have mild symptoms, and average viral shedding might be less than that of an adult (15). Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data. He says multiple studies have shown that "there's very little, if any, transmission after day 10, regardless of the variant . Hoarse voice. Mutations in Omicron might increase transmissibility, confer resistance to therapeutics, or partially escape infection- or vaccine-induced immunity. We take your privacy seriously. of pages found at these sites. Risk of long COVID associated with delta versus omicron variants of SARS-CoV-2. Fatigue. 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. (14) Some skin manifestations may be associated with increased disease severity. Jama. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. 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. Specific symptom information was available from 37 symptomatic persons. Pediatr Infect Dis J. Mar 1 2022;41(3):e81-e86. New loss of taste or smell. Hospitalization of Infants and Children Aged 0-4 Years with Laboratory-Confirmed COVID-19 - COVID-NET, 14 States, March 2020-February 2022. Reducing travel-related SARS-CoV-2 transmission with layered mitigation measures: symptom monitoring, quarantine, and testing. Exposure in restaurants has been shown to increase COVID-19 infection risk (14). Incubation periods are still just an average, and infected people may develop symptoms anytime within two to 14 days after exposure. October 2021; The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website. What Is Omicron's Incubation Period? - Verywell Health Omicron Infection Timeline: Exposure to Immunity - Health Jun 18 2022;399(10343):2263-2264. doi:10.1016/S0140-6736(22)00941-2, Notarte KI, Catahay JA, Velasco JV, et al. Jun 1 2021;4(6):e2111182. The CDC says that its guidelines were updated to reflect growing evidence that suggests transmission of COVID-19 often occurs one to two days before the onset of symptoms and during the two to . Volume 28, Number 4April 2022 - Emerging Infectious Diseases journal Hospitalizations Associated with COVID-19 Among Children and Adolescents - COVID-NET, 14 States, March 1, 2020-August 14, 2021. Clin Infect Dis. Aug 2020;25(32)doi:10.2807/1560-7917.Es.2020.25.32.2001483, Eyre DW, Taylor D, Purver M, et al. the date of publication. Heres what that means for infected individuals. Saving Lives, Protecting People. Multisystem Inflammatory Syndrome in Children by COVID-19 Vaccination Status of Adolescents in France. N Engl J Med. 2021/12/01/ 2021;80:229-238. doi:https://doi.org/10.1016/j.clinimag.2021.06.039, Kanne JP, Bai H, Bernheim A, et al. Data is collected weekly and does not include downloads and attachments. COVID-19 signs, symptoms and severity of disease: A clinician guide COVID-19 in Immunocompromised Hosts: What We Know So Far. 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. Mar 2022;10(3):e326-e328. Short-term and Long-term Rates of Postacute Sequelae of SARS-CoV-2 Infection: A Systematic Review. days (95% CI). N Engl J Med. (3,4) Presentation doi:10.1016/S2214-109X(21)00593-3, Belay ED, Abrams J, Oster ME, et al. Effectiveness of two-dose vaccination with mRNA COVID-19 vaccines against COVID-19-associated hospitalizations among immunocompromised adults-Nine States, January-September 2021. Aug 24 2022;75(1):e1165-e1175. EClinicalMedicine. MMWR and Morbidity and Mortality Weekly Report are service marks of the U.S. Department of Health and Human Services. Third, exposures from sources other than the infector of the pair might have been missed. No potential conflicts of interest were disclosed. 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. Characterizing long COVID in an international cohort: 7 months of symptoms and their impact. All persons aged 5 years should be vaccinated against COVID-19. Epidemiology of Infections with SARS-CoV-2 Omicron BA.2 Variant, Hong Kong, January-March 2022. Effectiveness of a Third Dose of Pfizer-BioNTech and Moderna Vaccines in Preventing COVID-19 Hospitalization Among Immunocompetent and Immunocompromised Adults - United States, August-December 2021. When Are You No Longer Contagious With COVID-19? That change was announced in late December, before the height of the omicron peak in the U.S. JAMA Netw Open. doi:10.1001/jamanetworkopen.2021.43151, Kompaniyets L, Agathis NT, Nelson JM, et al. 2022:o110. Among 43 cases with initial follow-up, one hospitalization and no deaths were reported. Even though the incubation period did not statistically differ, serial interval was significantly decreased in Omicron (mean 4.8 vs. 5.3, median 4 vs. 5) and was again more grouped to the left (IQR 3 vs. 5). SARS-CoV-2 B.1.1.529 (Omicron) variantUnited States, December 1-8, 2021. "Omicron has the shortest incubation period. 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). Feb 24 2022;386(8):713-723. doi:10.1056/NEJMoa2117995, Price AM, Olson SM, Newhams MM, et al. On December 2, CDC amended its existing Order requiring predeparture testing for all air passengers to the United States from any other country. The Amended Order, effective December 6, shortened the window for obtaining a negative SARS-CoV-2 viral test result to no more than 1 day before the flights departure. You can review and change the way we collect information below. However, there was a range: Some . Demographic Disparities in Clinical Outcomes of COVID-19: Data From a Statewide Cohort in South Carolina. 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. The. 2021;56(6):1342-1356. doi:10.1002/ppul.25344, Rubens JH, Akindele NP, Tschudy MM, Sick-Samuels AC. Emerg Infect Dis. 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. https://www.ncbi.nlm.nih.gov/sars-cov-2external icon, https://www.cdc.gov/coronavirus/2019-ncov/variants/spheres.html, ** https://covid.cdc.gov/covid-data-tracker/#variant-proportion. Accessed December 3, 2021. Underlying Medical Conditions and Severe Illness Among 540,667 Adults Hospitalized With COVID-19, March 2020-March 2021. These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. 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. 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). A negative test result closer to the time of travel enhances reduction in transmission risk during travel (6). On November 26, WHO designated B.1.1.529 as a variant of concern (3), as did the U.S. SARS-CoV-2 Interagency Group (SIG)* on November 30. Incidence and clinical phenotype of multisystem inflammatory syndrome in children after infection with the SARS-CoV-2 delta variant by vaccination status: a Danish nationwide prospective cohort study. Five pools collected November 30December 6, representing 59 travelers, had evidence of SGTF. Through these investments, an average of 50,00060,000 positive specimens are sequenced weekly as part of national SARS-CoV-2 genomic surveillance, which assisted with identifying initial cases of COVID-19 attributed to the Omicron variant in the United States. 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. Will Omicron Show Up On Rapid COVID Tests? ** Based on CDC analysis of the sequences currently available, and accounting for clustering, CDC estimates a 95% chance of detecting the Omicron variant if it accounted for 0.03% of circulating SARS-CoV-2 lineages during the week ending November 13 and for 0.05% of circulating lineages during the week ending November 20 (4). The CDC recently examined what happened to a Nebraska patient who was reportedly infected with the . Pediatr Infect Dis J. doi:10.1093/cid/ciab1007, Miller AD, Yousaf AR, Bornstein E, et al. The incubation period is the period from when a person becomes infected to when they start showing symptoms. What is the Incubation Period for the Omicron Variant and How - MSN Trends in Treatments for Multisystem Inflammatory Syndrome in Children (MIS-C), United States, February 2020 - July 2021. Cookies used to make website functionality more relevant to you. Characteristics, Outcomes, and Severity Risk Factors Associated With SARS-CoV-2 Infection Among Children in the US National COVID Cohort Collaborative. One vaccinated patient was hospitalized for 2 days, and no deaths have been reported to date. 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. 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. 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. BMJ. 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. All authors have completed and submitted the International Committee of Medical Journal Editors form for disclosure of potential conflicts of interest. CDC Updates and Shortens Recommended Isolation and Quarantine Period Lancet Infect Dis. Some older adults can experience COVID-19 infection accompanied by delirium, falls, reduced mobility or generalized weakness, and glycemic changes. MMWR Morb Mortal Wkly Rep. Jan 28 2022;71(4):146-152. doi:10.15585/mmwr.mm7104e4, Taylor CA, Whitaker M, Anglin O, et al. 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 . TaqPath COVID-19 Multiplex Diagnostic Solution. JAMA Intern Med. How Long Before Omicron Symptoms Appear After COVID Exposure? - NBC Boston If the pair shared meals on both July 4 and 5, we excluded all data from this pair. Maternal, fetal and neonatal outcomes of large series of SARS-CoV-2 positive pregnancies in peripartum period: A single-center prospective comparative study. 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. Apr 19 2021;193(16):E540-e548. ThermoFisher Scientific. Coronavirus Incubation Period: How Long and When Most Contagious - WebMD High rates of rapid antigen test positivity after 5 days of isolation for COVID-19. These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. 45 C.F.R. They help us to know which pages are the most and least popular and see how visitors move around the site. BMJ. . Sep 2021;8(9):ofab428. CDC updates and shortens recommended isolation and quarantine period for general population. Centers for Disease Control and Prevention. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance. Gronvall said when people are infectious, a rapid . Characteristics and Disease Severity of US Children and Adolescents Diagnosed With COVID-19. 2022;149(1):e2021053418. Dr. Edwards adds that it is too early to tell anything about the mortality rate and . CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. doi:http://dx.doi.org/10.15585/mmwr.mm7113e1, Pingali C, Meghani M, Razzaghi H, et al. Multisystem Inflammatory Syndrome in Children During Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Delta and Omicron Variant Circulation-United States, July 2021-January 2022. Probability densities for incubation period distribution during different SARS-CoV-2 variant-dominant periods in study of SARS-CoV-2 incubation period during the Omicron BA.5dominant period in Japan. CDC twenty four seven. . doi:10.1001/jamanetworkopen.2021.28568, Tillett RL, Sevinsky JR, Hartley PD, et al. Classification of Omicron (B.1.1.529): SARS-CoV-2 variant of concern. Am J Transplant. What's COVID's incubation period? Can Omicron spread if you're doi:10.1001/jamanetworkopen.2021.11182, Feldstein LR, Tenforde MW, Friedman KG, et al. If you need to go back and make any changes, you can always do so by going to our Privacy Policy page. OToole , Scher E, Underwood A, et al. BMJ. National surveillance of bacterial and fungal coinfection and secondary infection in COVID-19 patients in England: lessons from the first wave. 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 best way to protect yourself and those around you is to get vaccinated, Oller said. Overall, the average incubation period of all the variants was 6.57 days, ranging from 1.8 to 18.87 days. 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. Lancet Respir Med. (16) Both people who have been vaccinated and those who have not been vaccinated can transmit virus. No hospitalizations or deaths were reported. 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.