Thereâs a lot that we donât know yet about Omicron, the coronavirus variant thatâs powering the latest surge in infections. Reported to the World Health Organization less than a month ago, Omicron was responsible for almost three-fourths of U.S. coronavirus infections by Dec. 20.
Itâll take weeks, maybe months, to collect all the data for scientists to feel confident giving definitive answers. But Paula Cannon, a virology professor at USC Keck School of Medicine, said we should have a clearer picture in about two weeks.
âWe should start to have a sense of whether or not this is going to be an incredibly infectious but potentially milder version of COVID , or whether itâs incredibly infectious and just as bad as every other version of COVID,â she said.
Here are some of the key questions that researchers are still trying to answer.
Is Omicron as deadly as previous coronavirus variants? Since emerging in South Africa last month, Omicron has not driven up death rates there â and in fact, the surge in infections is already fading . And so far in the United States, only one confirmed Omicron-related death had been reported as of Tuesday, claiming the life of an unvaccinated person whoâd recovered from a previous bout with COVID-19.end the pandemic with a whimper , not a bang, health officials donât have enough data to conclude yet just how virulent the variant may be or why. We do have three preliminary studies â one from South Africa , one from England and one from Scotland â that report a lower hospitalization rate for people infected with Omicron than for those infected with other variants. But researchers also noted that Omicron patients are more likely to have been helped by antibodies from vaccinations or previous infections than was the case during earlier COVID-19 waves, so itâs not an apples-to-apples comparison. Also, many of the early Omicron cases have been among younger people , who are less likely to be hospitalized from COVID-19 in general. study from Hong Kong that hasnât been peer-reviewed offers one other glimmer of hope, finding that Omicron moves into the lungs much more slowly than earlier versions of the virus.
Why is it spreading so fast? Early research suggests that Omicronâs mutations have enabled it to circumvent the bodyâs defenses more effectively and replicate faster. Although those studies still need to be reviewed by independent scientists and corroborated by others, we are at least getting some hints as to the answer.
How much protection from Omicron will vaccines (and boosters) give? The data show that fully vaccinated people are vulnerable to being infected by Omicron, just as theyâve been to the Delta variant. Early research also suggests that boosters are particularly important in protecting against Omicron. But scientists are still exploring what it is about the mutations in the new variant that reduce the effectiveness of antibodies â whether gained through vaccination or a past infection â and how effective the bodyâs other defenses remain.significantly increased the level of antibodies available to defend against Omicron. Pfizer also has stated that lab tests show its booster yielded a dramatic increase in antibodies to fight the variant.
Will vaccines need to be retooled for Omicron? Possibly, but itâs too early to tell whether the current vaccines and boosters will give enough protection or whether weâll need more frequent booster shots. Top U.S. health officials have expressed faith that the existing vaccines will continue to offer some shielding , particularly to those whoâve received a booster shot .Omicron-specific version of its COVID-19 vaccine on Nov. 25 and is expecting delivery of the new vaccine by March, pending regulatory approval.
How will Omicron affect those who are not vaccinated? Early research has shown that unvaccinated people are, predictably, more vulnerable to infection by Omicron â just like with previous coronaviruses
Are there different symptoms? Thereâs anecdotal evidence that the main symptoms of Omicron are nasal congestion, dry cough and fatigue. This is a departure from the fever and loss of taste and smell seen with other variants. But researchers need more data to confirm any differences and explain why they exist.
Will medicines that work on other variants work the same with Omicron? Doctors are warning that two antibody drugs from Regeneron and Eli Lilly , which have been the go-to treatments for early COVID-19, will be less potent against Omicron. The drugmakers say that they can quickly develop new versions with Omicron-targeting antibodies, but they arenât expected to launch for at least several months.Pfizer has confirmed that its newly authorized COVID-19 treatment pill, Paxlovid, retained its potency against the Omicron. Unlike the antibody drugs, Paxlovid doesnât target coronavirusâ spike protein, which is where Omicronâs mutations are concentrated. newly authorized antiviral pill from Merck , called molnupiravir, is also expected to work against Omicron.
Is there an increased risk of reinfection? Preliminary evidence suggests yes, Omicron is more likely to cause repeat infections than earlier variants, according to the World Health Organization. Just as vaccine-induced antibodies seem to be less effective because of mutations in Omicronâs spike protein, the same appears to be true for antibodies generated from a past infection. Omicron is 5.4 times more likely to cause a reinfection .
Will the prevention measures weâve been taking throughout the pandemic (masking, social distancing) work as well with Omicron? The answer depends on why Omicron spreads more readily than its predecessors. In other words, we donât know yet.
Wear a mask when youâre indoors in a public place or with people outside of your household. Get tested when youâre going to be in high-risk situations for you or those around you, or if youâve been exposed to a coronavirus-positive person or have symptoms yourself. What do we know about outdoor transmissibility? Does that not provide the same risk mitigation it used to? So far, it appears that thereâs still a lower risk of getting infected if you are outdoors because thereâs less ability for viral particles to accumulate, Plummer said.
Does Omicron affect people in different age groups differently? Early reports from South Africa and Scotland showed that most new Omicron cases were reported in people in their 20s and 30s, and they had mild symptoms. Public Health Scotland officials said the age profile could reflect âearly detection of a large number of cases in events that typically attract people in these age groups.â Younger people are also less likely to be vaccinated, and thus more likely to become infected with any coronavirus variant.
How long will this Omicron surge last? Time will tell, but the rapid rise and fall of Omicron case counts in South Africa gives some people hope that this wave could be short-lived.
Will the spread of Omicron increase the odds of an even more transmissible (or nastier in some other way) variant? At this point we have little more than history to guide us, and weâve seen previous viruses mutate in both directions â more benign and more deadly . Plummer reminds us that we knew new variants could keep cropping up as long as there were people with active coronavirus infections. The best way to combat the effects of these variants is to have more people get vaccinated, including with the most recent booster shots, she said.
This report was written by Times staff writers Salma Loum, Madalyn Amato, Karen Garcia, Ada Tseng and Jon Healey. The Times Utility Journalism Team works to publish information that can solve problems, answer questions and help with decision making.
