New COVID Variant PJ.2.1 Is Spreading Globally: Why Its Cold-Like Symptoms Could Be Misleading

A new COVID-19 variant, PJ.2.1, is being detected in several countries, raising questions about its spread and potential health risks. The World Health Organization (WHO) has warned that symptoms associated with the variant may resemble those of the common cold or seasonal flu, making it difficult to identify the infection based on symptoms alone.

The variant belongs to the SARS-CoV-2 family of viruses, which causes COVID-19. According to an October 2026 preprint study, the first confirmed sample of PJ.2.1 was detected in Ontario, Canada, on May 2, 2026. It was subsequently identified in other parts of Canada, the US and several countries, including Spain, France, Israel, Singapore, Australia and New Zealand.

What Makes the PJ.2.1 Variant Different?

PJ.2.1 has several mutations in its spike protein, the structure that allows the coronavirus to attach to human cells and enter them.

Researchers investigating the variant found that it may bind more effectively to ACE2 receptors, which are present on the surface of human cells. This could potentially contribute to its spread.

However, the findings did not show that PJ.2.1 has substantially greater ability to evade antibodies produced after vaccination than most of the other variants examined. The October study is a preprint and has not yet undergone peer review, so its findings should be interpreted cautiously.

What Are the Symptoms of PJ.2.1?

According to the WHO, COVID-19 symptoms can overlap with those of influenza and other respiratory infections. These may include:

• Fever or chill
• Cough
• Sore throat
• Runny or blocked nose
• Headache
• Muscle and body aches
• Severe tiredness or fatigue

NOTE: Some people may also experience digestive problems, shortness of breath, or changes in their sense of smell and taste.

The WHO has emphasised that symptoms alone cannot establish whether someone has COVID-19, influenza or another respiratory infection. Testing may be important when identifying the infection could influence treatment decisions.

Also Read: H1N1 vs COVID-19 vs Dengue: Fever, Body Ache or Something More? How to Tell the Difference

Is PJ.2.1 More Dangerous Than Earlier COVID Variants?

There is currently insufficient evidence to establish that PJ.2.1 causes more severe illness, increases hospital admissions or raises the risk of death.

Laboratory findings about how a virus interacts with human cells or antibodies do not necessarily indicate how severe an infection will be in people. Further research and surveillance are needed to understand its behaviour.

Older adults, people with weakened immune systems and those with underlying health conditions remain more vulnerable to severe COVID-19.

Should You Be Concerned?

The emergence of another variant does not automatically mean a new wave of severe infections is approaching. However, people should not dismiss persistent fever, cough, sore throat or unusual fatigue as a routine cold.

COVID-19 vaccination remains important for reducing the risk of severe illness, hospitalisation and death. People at higher risk should consult their doctors about recommended vaccinations.
If you develop respiratory symptoms, avoid close contact with vulnerable people, maintain hand hygiene and consider testing when advised by a healthcare professional. Seek medical attention if you experience breathing difficulty or other severe symptoms.

NOTE: For now, continued monitoring, appropriate testing and vaccination remain important as scientists learn more about PJ.2.1.