Anna Moneymaker/Getty Images SARS-CoV-2 infection in farmed minks, the Netherlands, April and May 2020. These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. CDC COVID data tracker that can be filtered by region: covid.cdc.gov/covid-data-track #variant-proportions, Provided by As of April 2023, the COVID-19 pandemic has resulted in 1.1 million deaths in the United States, with approximately 75% of deaths occurring among adults aged 65 years (1).Data on the durability of protection provided by monovalent mRNA COVID-19 vaccination against critical outcomes of COVID-19 are limited beyond the Omicron BA.1 lineage period (December 26, 2021-March 26, 2022). Saving Lives, Protecting People, Given new evidence on the B.1.617.2 (Delta) variant, CDC has updated the, The White House announced that vaccines will be required for international travelers coming into the United States, with an effective date of November 8, 2021. A new Omicron spawn fueling a surge of cases in Indiaconsidered the most transmissible COVID variant yethas reached reportable levels in the U.S., the Centers for Disease Control and Prevention said Friday. Gohil adds that the CDC's new findings are also forcing hospitals to recalibrate because treating delta or omicron requires different antibodies and medications. We measured neutralizing titers against a panel of viral pseudotypes based on a lentiviral (HIV) backbone and bearing the S proteins of the predominant circulating variants in the United Kingdom to investigate the specificity of the neutralizing response. The change is motivated by science demonstrating that the majority of SARS-CoV-2 transmission occurs early in the course of illness, generally in the 1-2 days prior to onset of symptoms and the 2-3 days after. In the U.S., levels of XBB.1.16 are highest in the south central region, where they are projected to represent more than 20% of cases, and on the West Coast, where they hover around 10%, according to the CDC. The true figure could be as high as 58%. Risk factors for SARS-CoV-2 infection and illness in cats and dogs. Delta(B.1.617.2) was first identified in India in late 2020; it soon spread throughout the world, becoming what was the predominant version of the coronavirusuntil Omicron took its place in mid-December. 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. That's a rise from 5.7 . With several major mutations, the Omicron variant has spread rapidly around the globe and shattered records for new daily cases in the US. Severity: Studies have suggested the B.1.1.7 lineage was more likely to land infected people in the hospital and was deadlier than the original virus. Note: Information in this article was accurate at the time of original publication. New lineages continue to emerge and spread in the United States and globally. Authorities said even as Omicron shatters records for new cases, they are hopeful the surge will quickly subside, and said the US needs to focus on ensuring hospital systems do not collapse amid the surge. Even as Omicron stresses essential systems, severe illness is not inevitable, and health authorities stressed the importance of vaccination to reduce the likelihood of severe illness. Overall seropositivity across We screened residual blood samples from 2,309 cats by using PVNA at a final dilution of 1:100; the samples were submitted to the University of Glasgow Veterinary Diagnostic Services laboratory (VDS) during April 2020February 2022 (Figure 1, panel A). Terms & Conditions. Our results showed that SARS-CoV-2 seroprevalence in UK cats increased over time (Figure 1, panel B). Scientists believe BA.5 is the most contagious version of COVID-19 thus far, and. 1.16, accounts for 14.6 percent of cases in the US, according to the latest Centers for Disease Control and Prevention (CDC) variant tracker . It and the BA.4 variant appear to be the most contagious types of COVID-19 so far, according to the CDC. Everyone should be masking when indoors around anyone not in their household, as well as in crowded areas outdoors where it is impossible to socially distance, like sporting events, Blumberg said. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. The most recent report shows that as of Dec. 25, 59% of all U.S. infections were caused by omicron. Comment submitted successfully, thank you for your feedback. Cookies used to make website functionality more relevant to you. B.1-dominant samples generally had slightly lower titers against the Alpha pseudotype than against B.1. Note: Information provided in Yale Medicine articles is for general informational purposes only. Take steps to, For the most up to date information on current variants, visit CDCs. Centers for Disease Control and Prevention. All lineages currently circulating are classified as part of the Omicron variant. But some people are contagious for longer periods. How contagious is it? More information is available, Recommendations for Fully Vaccinated People, National Center for Immunization and Respiratory Diseases (NCIRD), International Travel to and from the United States, Requirement for Proof of COVID-19 Vaccination for Air Passengers, U.S. Department of Health & Human Services. This map of test sites and this list from the Sacramento County COVID-19 Collaborative are also helpful. XBB.1.5, also known as Kraken, rose to U.S. and global prominence during a winter wave of cases. Throughout the study period (April 2020February 2022), no Omicron-dominant seropositive samples were identified; we anticipated this finding because only a small proportion of samples were collected after the Omicron variant emerged. "The way in which we test and the way in which we have certitude about the numbers was all in flux right at that moment. While XBB.1.16 looks to be on the path for eventual U.S. dominance, other up-and-coming Omicron spawn could provide competition, Rajnarayanan sayslike XBB.2.3 and descendants, and XBC.1.6 and descendants. "There's no way around it, it is a huge swing that makes it seem like something went really wrong," Dr. Shruti Gohil, associate medical director for epidemiology and infection prevention at UC Irvine's School of Medicine, told NPR. The CDC's latest report adjusts the numbers and better reflects what was happening around the country at the time, she added. A new COVID-19 Omicron sublineage, XBB.1.16, is slowly spreading in the United States. In those that are fully vaccinated and boosted, symptoms tend to be mild. No content in the articles should ever be used as a substitute for medical advice from your doctor or other qualified clinician. "As long as samples keep coming in, we at the UW Medicine virology lab will continue to conduct genomic sequencing for viral surveillance for as long as we can," said Roychoudhury, who works on COVID virus genetic tracking. According to the most recent data from the Centers for Disease Control and Prevention (CDC), Arcturus is estimated to account for 9.6% of COVID cases in the United States. The CDC recently updated guidelines on isolation and quarantine to reflect the current science on the Omicron variant for when and how long an infected individual is most contagious. We thank Dawn Dunbar and Andrea Bowie for assisting with sample provision. A lot of that is because many more people are vaccinated. Some variations allow the virus to spread more easily or make it resistant to treatments or vaccines. Anyone exhibiting symptoms should get tested for COVID-19. Many. In that regard, XBB.1.16 may not change much, if anything. Miss Tyson is a PhD candidate at the MRC-University of Glasgow Centre for Virus Research, Glasgow, Scotland. XBB.1.16 is a recombinant of two descendants of so-called stealth Omicron BA.2. According to earlier CDC guidance, COVID symptoms can appear anywhere from two to 14 days after someone is exposed to the virus. Severity:Scientists are still working to learn more about whether the current Omicron strains cause more severe disease than their predecessors. Seropositivity of samples included in analysis in study of SARS-CoV-2 seroprevalence and immunity in cats, United Kingdom, April 2020February 2022. In all 5 cases, the neutralizing titers against SARS-CoV-2 waned over time. This site uses cookies to assist with navigation, analyse your use of our services, collect data for ads personalisation and provide content from third parties. University of Washington School of Medicine, covid.cdc.gov/covid-data-track #variant-proportions, Mayo Clinic expert talks about the new omicron variant, New variant increases the risk of 'longer COVID,' warns expert, Omicron XBB1.5 'Kraken' subvariant appears to be the most transmissible so far, WHO estimates 90% have some resistance to Covid, COVID-19 variant BA.5 is dominant strain; BA.2.75 is being monitored, Is a hybrid COVID strain behind Vietnam's latest wave? On December 1, the CDC confirmed the first case in the U.S., in an individual in California who had returned from South Africa in November. Subscribe to Well Adjusted, our newsletter full of simple strategies to work smarter and live better, from the Fortune Well team. The CDC's newest guidance shifted the timing for isolation and quarantine as some experts say the time frame when people are most contagious is earlier. Omicron has a few major offshoots, also called sublineages, branching off from B.1.1.529. Severity: There was evidence to suggest that Beta may have been more likely than other variants to lead to hospitalization and death. Some variants spread more easily and quickly than others, which may lead to more cases of COVID-19. Can vaccination prevent it? Friday was the first time the CDC had assigned XBB.1.16 its own category. Anthropogenic transmission of SARS-CoV-2 to pet cats highlights the importance of monitoring felids for exposure to circulating variants. The five reinfections, including one after full vaccination, might be explained by waning immunity, the potential for partial immune evasion by Omicron, or both.. He has spearheaded efforts to assign street names like Arcturus and Kraken to variants when the WHO chose not to assign new Greek letters to them, in an effort to make some sense out of the COVID alphabet soup. UC Davis Medical Centers ED has seen a record number of patients recently, and providers need to care for those who are seriously ill. Unfortunately, Omicron is so transmissible that even fully vaccinated and boosted individuals may get infected, Pollock explained. Suspected cat-to-human transmission of SARS-CoV-2, Thailand, JulySeptember 2021. We have the tools to fight variants. XBB.1.5 is still technically top dog in the U.S., but it looks spent, Raj Rajnarayanan, assistant dean of research and associate professor at the New York Institute of Technology campus in Jonesboro, Ark., and a top COVID variant tracker, tellsFortune. Janet Woodcock made the comments at a Senate hearing where senators, especially Republicans, harshly questioned administration officials virus response. the Science X network is one of the largest online communities for science-minded people. 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. All three vaccines in the U.S. were considered highly effective against severe illness, hospitalizations, and death from Delta. If you still have symptoms after isolating for five days, stay home until you feel better and then start your five days of wearing a mask at all times. Because information about COVID-19 changes rapidly, we encourage you to visit the websites of the Centers for Disease Control & Prevention (CDC), World Health Organization (WHO), and your state and local government for the latest information. What does it mean for you? However, Roychoudhury added, coronavirus trackers cannot foresee what could happen in the fall when conditions, such as more people gathering indoors, once again support coronavirus transmission. That means that Day 1 is the first full dayafteryour symptoms developed. You might want to test again and of course symptoms you cannot ignore - scratchy throat, headaches, all kinds of symptoms - anything new can be a symptom of this new illness.". We still dont know how dangerous it is in people over 65 or those who are immunocompromised, but there is a concern that they may be at higher risk for severe disease, Blumberg said. Those samples also had significantly lower titers against both the Delta (p<0.0001) and Omicron (p<0.001) pseudotypes. 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. Updated: Feb. 3, 2023]. The CDC reports that the variant is now responsible for more than 98% of Covid-19 cases in the US, replacing Delta in less than a month. The city has not yet said if the new CDC guidance will change its travel advisory guidelines. The CDC says that while breakthrough infections in vaccinated people are expected, getting vaccinated and staying up to date with your vaccine and the latest booster shot is the best protection against Omicron. Days before the United States had its first confirmed case of the Omicron variant on Dec. 1 in California, health officials in Nebraska began looking into six probable cases of coronavirus infection in one household, among them a 48-year-old unvaccinated man who had recently returned from a conference in Nigeria. Pale, gray, or blue-colored skin, lips, or nail beds, depending on skin tone. Detection of new dominant variants in cats trailed detection of the variant in the humans; however, we detected dominant titers against extinct variants even after human cases had declined, possibly indicating long-lasting humoral immunity (Figure 2). The CDC said Beta was about 50% more contagious than the original coronavirus strain. In symptomatic case-patients with infectious virus detected on days 6-9 after symptom onset, infectious virus was also detected 0-2 days after symptom resolution. Beta was not common in the U.S. How contagious is it? We used a pseudotype-based neutralization assay (PTNA) to measure virus neutralizing antibody titers and a confirmatory ELISA that measured antibodies recognizing the receptor binding domain of the SARS-CoV-2 spike (S) protein. by Medical Xpress is a web-based medical and health news service that is part of the renowned Science X network. By using our site, you acknowledge that you have read and understand our Privacy Policy "But it's actually still too early to really know even that. CDC uses viral genomic surveillance to quickly identify and track COVID-19 variants, and acts upon these findings to protect the publics health. How contagious is it? This article was medically reviewed by Yale School of Public Health epidemiologist Nathan Grubaugh, PhD. Learn more about the different types of COVID-19 tests available. Yes. Read more about the spread of COVID-19: A new bivalent COVID-19 booster rolls out next month. CDC is working with many public health officials and partners to monitor all variants. A new omicron subvariant, XBB.1.16, is spreading in the United States, and some doctors are reporting that it may be causing unusual symptoms. This is why COVID-19 outbreaks are so hard to contain. How contagious is it? Besides, delta is the beast that you should be worried about.". Cases of adenovirus in children are also reportedly on the rise in India. FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. Specifically, the CDC said that most SARS-CoV-2 transmission occurs early in the course of the illness, in the one to two days before the onset of symptoms and for two to three days after. https://www.nytimes.com/2021/12/28/world/omicron-covid-contagious-cdc.html. Given the CDC's updated information, Gohil said, "The implication is that we have a lot of delta going on and that requires a lot more attention.". Monday - Friday, 8 a.m. - 5 p.m.:hs-publicaffairs@ucdavis.edu916-734-9040, After business hours, holidays or weekends:hs-publicaffairs@ucdavis.edu916-734-2011 (ask for public information officer), 2023UC Regents. Meanwhile, experts are still learning about several newer Omicron strains circulating in the U.S., each of which, as of mid-December, were causing less than 6% of infections.