New COVID Variant Symptom – What to Know in 2025/2026

New Omicron subvariants continue to circulate in 2025 and 2026, bringing familiar symptoms alongside some notable changes. While the disease still resembles a bad cold for most people, a sharp, stabbing throat pain has emerged as a distinguishing feature in certain strains. Understanding what to look for, when to test, and how long symptoms last can help you respond quickly and reduce the risk to others.

The latest variants, including those informally named Cicada, Stratus (XFG), and NB.1.8.1 (sometimes called Nimbus), are all descendants of Omicron. They spread more easily than earlier strains but do not appear to cause more severe illness in vaccinated individuals, according to academic medical centres. However, high-risk groups remain vulnerable to serious outcomes.

Symptom profiles have shifted since the early pandemic. Loss of taste or smell is now reported less frequently, while upper respiratory complaints dominate. This makes it harder to distinguish COVID-19 from a common cold, flu, or allergies without a test.

What are the 3 new COVID symptoms?

No health authority officially lists exactly three new symptoms for the latest variants. The phrase reflects media and social commentary about the most common presentations seen in clinics. Across sources including the CDC, the NHS, and UChicago Medicine, the symptoms reported most often are sore throat, runny nose or congestion, headache, cough, and fatigue. Fever, body aches, and sneezing are also common. A sharp, severe sore throat—described by some patients as razor-blade throat or stabbing pain when swallowing—has been highlighted by Stony Brook Medicine in connection with the Nimbus strain.

Key insights at a glance

• Latest Omicron subvariants cause symptoms that resemble a bad cold, with loss of taste or smell occurring less frequently than in earlier waves.
• The idea of exactly three new symptoms is not an official classification; it reflects the most common complaints clinicians are hearing.
• A sharp, stabbing sore throat—sometimes called razor-blade throat—has been reported with the NB.1.8.1 (Nimbus) subvariant.
• Isolation rules have relaxed in many countries, but high-risk individuals should still test promptly and stay home when symptomatic.
• Rapid antigen tests can detect current variants, though sensitivity may vary; repeat testing 24–48 hours after a negative result is recommended if symptoms persist.
• Vaccination and prior infection continue to reduce the risk of severe illness, but reinfection remains common.

Common symptoms and variant facts

What are the first symptoms of COVID?

The earliest signs of infection with current Omicron subvariants are often subtle. Many people report starting with a scratchy or sore throat, followed closely by a runny or congested nose. Headache and fatigue typically appear within the first day or two. A cough may develop shortly after. Some individuals describe the initial feeling as just a cold and do not suspect COVID-19 until symptoms worsen or they test.

According to research cited by Healthline, the order of symptom appearance for Omicron-related variants often begins with sore throat, then congestion, headache, and body aches. This sequence differs from earlier strains where fever and loss of smell were more prominent early on.

How to tell the difference from a cold or flu

Differentiating COVID-19 from other respiratory infections based on symptoms alone is difficult. The CDC notes that COVID-19 can cause a wide range of symptoms, and many overlap with influenza and RSV. However, the sharp throat pain reported with some newer subvariants is less typical of a standard cold. Fever, if present, is more common with flu and COVID-19 than with a cold. Loss of taste or smell, though less frequent now, remains a stronger indicator of COVID-19 when it does occur.

How long does COVID last?

For most vaccinated people, a mild case of COVID-19 from current Omicron subvariants lasts between 5 and 10 days. OSU Health, which tracks the Stratus (XFG) strain, reports an average recovery window of 5 to 10 days. During this time, symptoms typically peak around days 3 to 5 before gradually improving.

However, certain symptoms can persist beyond the acute phase. Fatigue, cough, and nasal congestion are the most common lingering issues. Older adults and individuals with underlying health conditions may experience a slower recovery. The research from UChicago Medicine and other academic sources indicates that while the acute illness is generally shorter than with Delta, residual symptoms can last up to two weeks or more in some cases.

Factors that influence recovery time

Several factors affect how long symptoms last. Age, vaccination status, the presence of chronic conditions such as diabetes or heart disease, and whether the person has had COVID-19 before all play a role. People who are up to date with boosters tend to recover faster and experience milder symptoms. Reinfection can still occur and may feel similar to a first infection, though prior immunity often shortens the duration.

New COVID isolation rules

Isolation guidance has evolved significantly since the early pandemic. Current recommendations from the CDC and NHS focus on symptom improvement rather than fixed day counts. The CDC advises staying home while you are sick and until your symptoms are improving and you have been fever-free for at least 24 hours without using fever-reducing medication. After returning to normal activities, wearing a mask around others, practising hand hygiene, and avoiding close contact with high-risk people for several more days is recommended.

Some clinical guidance sources still advocate a more conservative approach: isolating for at least five days from symptom onset and masking around others until about day 10 or until symptoms fully resolve. The NHS advises staying home until you no longer have a fever and feel well enough to return to normal activities.

Testing is a key part of the isolation decision. The Ubie Health summary notes that COVID-19 tests do not identify the variant; they only confirm the presence of SARS-CoV-2. Rapid antigen tests remain effective, but if symptoms persist after a negative result, repeat testing 24–48 hours later is advised. PCR tests offer higher sensitivity and can be considered when rapid tests remain negative despite ongoing symptoms.

What does a typical COVID infection look like day by day?

The incubation period for current Omicron subvariants appears to be shorter than for earlier strains—typically 3 to 4 days, though it can range from 2 to 14 days. Onset is often sudden, beginning with a sore throat or fatigue.

1. Exposure day 0: Contact with the virus occurs. No symptoms yet.
2. Days 2–4: First symptoms appear—usually sore throat, fatigue, and runny nose. Some people also develop headache.
3. Days 3–5: Symptoms peak. Cough, congestion, headache, and body aches are most intense. Fever may develop.
4. Days 6–7: Gradual improvement begins for mild cases. Sore throat and fever typically resolve first.
5. Days 7–10: Most symptoms resolve, though cough and fatigue may persist for another week or longer.
6. Day 10–14: Full recovery for most. Some individuals may continue to experience fatigue or cough beyond this point.

The timeline is based on reports from OSU Health, UChicago Medicine, and Nebraska Medicine, which track symptom progression in patients infected with the latest Omicron subvariants. Variability is common, and individuals with underlying conditions may experience a longer course.

What is known and what remains uncertain about new variants?

How have COVID symptoms changed over time?

The evolution of SARS-CoV-2 from the original strain to Omicron subvariants has shifted the symptom profile significantly. Early in the pandemic, COVID-19 commonly caused lower respiratory symptoms such as pneumonia and severe shortness of breath. Loss of taste and smell was a hallmark sign. Today, the dominant Omicron subvariants primarily affect the upper respiratory tract, producing cold-like symptoms. This shift has made clinical diagnosis more challenging, as distinguishing COVID-19 from flu, RSV, and the common cold now relies heavily on testing.

Public health messaging in the 2025–2026 season emphasises symptom recognition alongside testing. The Cicada variant, named informally by some outlets, is one of several Omicron lineages circulating. The Boots Health Hub lists high temperature, sore throat, new persistent cough, and loss of taste or smell as symptoms of the Cicada variant, though loss of taste or smell is now less common. Vaccination and prior infection continue to reduce severity, but reinfection remains frequent.

What do official health sources say?

Major health authorities and academic medical centres have published guidance on symptoms and testing for the latest COVID-19 variants. Their statements are consistent in describing the current symptom picture as cold-like, with a notable sore throat component in some cases.

COVID-19 symptoms can include a high temperature, new continuous cough, loss of smell or taste.

— UK NHS

People with COVID-19 have reported a wide range of symptoms – from mild symptoms to severe illness.

— US CDC

Cicada variant symptoms include high temperature, sore throat, new cough, loss of smell/taste.

— Boots Health Hub

Most infections with the latest Omicron subvariants look like a bad cold: runny nose, sore throat, headache.

— Ubie Health

UChicago Medicine notes that NB.1.8.1 was first detected in 2025 and causes symptoms similar to prior variants, with no evidence of increased severity. Stony Brook Medicine highlights a sharp, stabbing sore throat as a notable symptom of the Nimbus strain. Nebraska Medicine confirms that current tests do not reveal the variant, only whether SARS-CoV-2 is present.

What should you do if you have symptoms?

If you develop a sudden sore throat, nasal congestion, cough, fatigue, or sharp throat pain when swallowing in 2025 or 2026, COVID-19 should be considered. Test promptly with a rapid antigen test, and repeat testing 24–48 hours later if the first result is negative and symptoms persist. Stay home until you are fever-free for at least 24 hours without medication and your symptoms are improving. High-risk individuals should consult a healthcare provider early. Staying updated on emerging variants through the CDC, ECDC, or WHO, and getting the latest vaccine booster, remain the most effective ways to reduce the risk of severe illness. For more detail, read our COVID-19 symptoms and testing guide and check the latest COVID-19 variant updates.

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