COVID Omicron BA2.75 Symptoms

As of the week ending September 24, 2022, BA.5 represent an estimated 83.1% of the SARS-CoV-2 variants currently circulating in the United States, according to the CDC. 

In India and Nepal, however, the prevalence of a subvariant of BA.2 (designated BA.2.75) is increasing rapidly and is now becoming dominant in Nepal (R). The World Health Organization has designated BA.2.75 as a “variant of concern lineage under monitoring.”


Moreover, BA.2.75 has been detected in at least 25 other countries, including the United States, Singapore, Canada, the United Kingdom, Japan, and Australia; as such, it has spread across multiple continents (R). In the United States, the BA 2.75 subvariant is hovering at 1.4% of the variants currently circulating in the US, as of the week ending September 24, 2022.

The Institute for Health Metrics and Evaluation (IHME) at the University of Washington and other experts, including Dr. Anthony Fauci, the nation’s top infectious disease expert, foresee a wave beginning to swell in late October, 2022 and peaking in late December or January.

It could kill another 20,500 Americans, according to the IHME.

While the coming wave may be caused by multiple variants, they may start to look increasingly similar as they mutate to become more efficient—and take the same path to achieve it.

The wave may be carried by one variant, Dr. Raj Rajnarayanan, assistant dean of research and associate professor at the New York Institute of Technology campus in Jonesboro, Ark., told Fortune.

“But if you look closer, they may all have the same set of mutations.”

And they may all end up with the same disastrous effect: rendering current COVID countermeasures like drugs and vaccines powerless.

The spawn of Centaurus

Omicron spawn BA.2.75, dubbed “Centaurus,” seemed like the COVID variant to watch this summer—one with the potential to wreak havoc later in the year.

But Centaurus is no longer a worry, according to Rajnarayanan. Instead, one of its children, BA.2.75.2, has outcompeted it, eliminating it as a threat—but replacing it with a more formidable one.

Why is BA.2.75.2 worrying experts?

Fauci this week called the BA.2.75.2 variant “suspicious,” in that it has the potential to develop into a variant of concern for the fall.

In Rajnarayanan’s book, it’s the most formidable of up-and-coming strains because of its spike protein—a feature that allows it to enter cells—binds more tightly to human cells than that of any other variant. By doing so, it makes it more difficult for antibodies to successfully attack.

The variant is picking up mutations that make it more similar to globally dominant BA.5 and the deadly Delta variant of late 2021. And it’s just “a couple of mutations away from picking up increased transmission speed,” Rajnarayanan said.

To make matters worse, the new variant shows “extensive escape” ability, according to a new preprint paper released this week by researchers at the Imperial College in London and the Karolinska Institute in Sweden.

The paper, which is not yet peer reviewed but has been widely cited by experts, called the variant “the most neutralization-resistant variant evaluated to date,” and said it may effectively evade antibody immunity, built by vaccination and prior infection.

A spin-off of a heavyweight champ

Another major contender: Omicron spawn BF.7. It’s a spin-off of globally dominant strain BA.5, three generations removed.

The new subvariant has a change in the spike protein seen in other Omicron strains making headway. It also has a change in the nucleotide sequence—sometimes referred to as the blueprint of an organism—that could cause it to behave differently than other subvariants, Dr. Stuart Ray, vice chair of medicine for data integrity and analytics at Johns Hopkins Department of Medicine, told Fortune this week.

Scientists are taking note of BF.7 because it’s making headway in an increasingly crowded field of Omicron subvariants.

“The same growth advantage in multiple countries makes it reasonable to think that BF.7 is gaining a foothold,” and that it’s potentially more transmissible than parent BA.5, Ray said.

Convergent evolution & ‘frankenviruses’

There are more contenders, including BQ.1.1. The variant is jockeying with BA.2.75.2 to lead the wave this fall, Rajnarayanan said.

Major players are beginning to pick up identical advantageous mutations as they try to gain supremacy over their rivals, according to Rajnarayanan. Some mutations offer advantages like increased transmissibility, while others make it more difficult for the human immune system—as well as treatments and vaccines—to fight them off.

It’s common for variants to garner multiple mutations—and increasingly, variants of potential concern are acquiring many of the same ones.

“Eventually all variants may look the same at the spike level,” Rajnarayana said.

Variant hunters are also keeping their eye on recombinants—combinations of multiple variants that form “frankenviruses” of sorts.

One Rajnarayanan and others are watching: XBB, a combination of two different Omicron spawns. It’s not currently a concern in terms of spread, but “it’s probably the most immune evasive yet”—even more so than the rising BA.2.75.2, which is more immune evasive than globally dominant BA.5, the most immune evasive until recently.

It’s a concerning pattern that has the ability to reduce the effectiveness of COVID treatments, as acknowledged by World Health Organization officials this week—and perhaps even vaccines. In a worst-case scenario, increasingly immune-evasive variants could render them ineffective entirely.

BA.2.75.2 is being watched for its potential to escape the immunity provided by the last antibody drug that is effective on all variants, Bebtelovimab, according to Rajnarayanan and other experts. It’s administered to those at high risk of serious outcomes from COVID.

According to a preprint (September 2022) by Yulong Richard Cao, an assistant Professor at Peking University’s Biomedical Pioneering Innovation Center in China, and others, BQ.1.1 beat it to the punch. The variant escapes immunity from Bebtelovimab, as well as another antibody drug that only works against some variants.

“Such rapid and simultaneous emergence of variants with enormous advantages is unprecedented,” Cao and others wrote in the paper.

It’s unknown how well new Omicron boosters will hold up against coming variants. But Cao’s paper notes that herd immunity and boosters may not protect against new strains. It urges the rapid development of broader COVID vaccines and new antibody drugs, and encourages researchers to test them against recombinants they construct in the lab, in an effort to gauge their effectiveness ahead of time.

Rajnarayanan worries for the future of COVID countermeasures and, like WHO officials, calls on countries to keep up testing and the genetic sequencing of samples. It’s the only way to know what’s coming, they contend. Ideally, such knowledge will allow researchers to scramble to create new countermeasures, or update old ones, as necessary.

BA2.75 Symptoms

According to the US CDC (updated August 2022), people with COVID-19 have had a wide range of symptoms reported – ranging from mild symptoms to severe illness. Symptoms may appear 2-14 days after exposure to the virus. Anyone can have mild to severe symptoms.

Possible symptoms include:
  • Fever or chills
  • Cough
  • Shortness of breath or difficulty breathing
  • Fatigue
  • Muscle or body aches
  • Headache
  • New loss of taste or smell
  • Sore throat
  • Congestion or runny nose
  • Nausea or vomiting
  • Diarrhea
However, these symptoms are not specific to the BA.2.75 subvariant as the dominant subvariant in the US currently is still the Omicron BA.5.

Further, these symptoms can easily be mistaken for a common cold, especially during a time when travel restrictions are being lifted, many choose not to seek out a COVID-19 test initially — until other symptoms present later down the road. 

"Omicron has the shortest incubation period that we've seen," infectious disease expert Amesh Adalja, MD, a senior scholar at the Johns Hopkins University Center for Health Security, told Health.

That incubation period is just about three days, compared to the Delta variant's five-day incubation period, and the original SARS-CoV-2 virus' incubation period of more than 5 days, according to a December 2021 report published in the CDC's Morbidity and Mortality Weekly Report (MMWR).

According to Dr. Adalja, Omicron's short incubation period may be influenced by built-up immunity from the past two years. Much of the population has been exposed to COVID-19 at one point or another—via vaccination or prior infection—which means their immune systems are already primed to jump into action more rapidly. How soon symptoms occur is directly tied to when your immune system recognizes and responds to the virus, said Dr. Adalja.

The shortened incubation period also means that people may test positive sooner, due to emerging symptoms. According to guidelines from the CDC (September 2022), you should test as soon as you begin feeling any cold- or flu-like symptoms.

"As your body starts recognizing the fact that it's been infected, your immune system will start taking actions, and those actions are those symptoms that you feel: fatigue, headache, malaise," said Dr. Adalja. People may not test positive during these initial symptoms, simply because there isn't enough virus in the body to show up on a test (though there is enough to make you feel unwell), he said.

Though symptoms of Omicron aren't drastically different from those associated with the Delta variant, they are manifesting differently, Pia MacDonald, PhD, MPH, an infectious disease epidemiologist at RTI International, told Health. The most commonly-reported symptoms with the original Omicron variant were cough, fatigue, headache, congestion, and runny nose, according to the CDC.

Research published in April 2022 in The Lancet also found that sore throat and hoarse voice were consistently more prevalent with Omicron infections than with Delta.

Meanwhile, loss of taste and smell, which was a common symptom with previous variants, is less likely to occur with Omicron.

Emergency warning signs

Individuals are reminded to seek immediate medical attention (go to a hospital’s emergency department) if they develop emergency warning signs of COVID-19 such as:

  • Difficulty breathing
  • Persistent pain or pressure in the chest
  • Bluish lips or face
  • New confusion or inability to arouse

Key Takeaway

As soon as you have symptoms, consult your healthcare provider and start treatment as early as possible. If treatment is delayed i.e. after 5 days of symptoms, your chances of severe COVID are higher.

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