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Understanding New COVID-19 Variant Symptoms

Understanding the Symptoms of New COVID-19 Variants: FLiRT and Beyond

Estimated reading time: 8 minutes

  • New COVID-19 variants like FLiRT (KP.2, KP.1.1, KP.3, and LB.1), NB.1.8.1 (“Nimbus”), XFG (“Stratus”), and XEC are circulating.
  • Symptoms largely mirror previous Omicron variants, including respiratory, systemic, and gastrointestinal issues.
  • Anecdotal evidence suggests potential unique symptoms in newer strains (e.g., “razor blade” throat sensation with NB.1.8.1).
  • Severity remains generally low, but vaccination is crucial for protection, especially for vulnerable populations.
  • Ongoing monitoring and research are essential for understanding evolving variants and adapting strategies.

Table of Contents

What are the FLiRT Variants?

The FLiRT variants (KP.2, KP.1.1, KP.3, and LB.1) are subvariants of Omicron’s JN.1 lineage. These variants emerged as dominant strains earlier in 2025, demonstrating high transmissibility but, importantly, not a significant increase in severity compared to previous Omicron variants. Their rapid spread underscored the ongoing need for vigilance and proactive health measures. While initially dominant, newer strains are now more prevalent, highlighting the ongoing evolution of the virus.

Common Symptoms Across New Variants:

  • Respiratory Symptoms: Nasal congestion or runny nose, sore throat, cough (often new and persistent), and shortness of breath or difficulty breathing are frequently reported.
  • Systemic Symptoms: Fatigue, headache, muscle or body aches, fever or chills are common indicators.
  • Gastrointestinal Symptoms: Nausea, vomiting, and diarrhea can also occur, though less frequently than respiratory symptoms.
  • Sensory Changes: While less prevalent than in earlier stages of the pandemic, a new loss of taste or smell can still be a symptom.

Specific Observations for Newer Strains: Anecdotal Evidence and Ongoing Research

While the core symptom profile remains consistent across most variants, some anecdotal observations point towards potential subtle differences in certain newer strains:

  • NB.1.8.1 (“Nimbus”): Anecdotal reports from UK physicians suggest a potentially unique symptom of a “razor blade” sensation in the throat, alongside increased gastrointestinal issues such as heartburn, bloating, and stomach pain. However, it’s crucial to emphasize that these observations require further scientific validation through larger-scale studies. More research is needed to confirm these findings as consistently associated with NB.1.8.1.
  • XFG (“Stratus”): Similarly, a hoarse voice has been anecdotally linked to XFG infections. Again, rigorous research is required to establish a definitive connection.

It’s vital to remember that these anecdotal observations highlight the need for ongoing research and surveillance. The lack of widespread, confirmed data prevents conclusive statements on the uniqueness or prevalence of these specific symptoms.

Severity and Contagiousness: The Importance of Context

The high transmissibility of FLiRT variants, particularly in their period of dominance, emphasized the continuing contagious nature of COVID-19. However, consistent with the trend observed with later Omicron variants, health authorities like the CDC and WHO have not reported a substantial increase in severe illness associated with these strains. This lessened severity is largely attributed to widespread vaccination efforts and the immunity acquired through previous infections, rather than an inherent reduction in the virus’s virulence.

It is essential to understand that the reduced severity does not diminish the risk, especially for vulnerable populations. Older adults and individuals with underlying health conditions remain at heightened risk for severe COVID-19, regardless of the specific variant.

The Current Variant Landscape (July-August 2025): A Dynamic Situation

As of July-August 2025, the COVID-19 landscape shows a shift away from the FLiRT variants’ dominance. Newer strains, including NB.1.8.1, LP.8.1, and XFG, are now more prevalent. This underscores the fluid nature of the pandemic and the necessity for continual monitoring and adaptation of strategies. The World Health Organization (WHO) maintains close surveillance of SARS-CoV-2 evolution, analyzing emerging variants and their potential impact on global health.

Differentiating COVID-19 from Other Illnesses

The symptoms of COVID-19, particularly those presented by newer variants, often overlap with other common illnesses like the seasonal flu or allergies. This overlap can make accurate diagnosis challenging. Therefore, it’s crucial to consult with a healthcare professional for proper assessment and testing if you experience symptoms suggestive of COVID-19.

Vaccination Remains Crucial: Protecting Yourself and Your Community

Despite the emergence of new variants, vaccination remains the most effective tool in preventing severe COVID-19, hospitalization, and the development of long COVID. Staying up-to-date with recommended booster shots is vital for maintaining robust protection against current and future variants.

Practical Takeaways and Actionable Advice for Businesses and Individuals:

  • Stay Informed: Keep abreast of the latest information from reliable sources like the CDC and WHO regarding emerging variants and public health recommendations.
  • Maintain Hygiene Practices: Continue practicing good hygiene, including frequent handwashing, covering coughs and sneezes, and disinfecting frequently touched surfaces.
  • Promote Vaccination: Encourage vaccination and booster shots within your workplace and community.
  • Implement Workplace Safety Measures: Businesses should maintain appropriate workplace safety measures to minimize the risk of transmission, including flexible work arrangements and enhanced ventilation.
  • Monitor Employee Health: Encourage employees to stay home if they are feeling unwell and seek medical advice if needed.
  • Promote Early Testing and Treatment: Encourage early testing and access to appropriate medical care to reduce the severity of illness and prevent complications.

Conclusion: Navigating the Evolving COVID-19 Landscape

The emergence of new COVID-19 variants like the FLiRT variants highlights the ongoing need for vigilance and proactive strategies. While symptoms largely remain consistent with previous strains, ongoing monitoring and research are essential to understanding the nuances of each variant. Vaccination, coupled with responsible hygiene practices and proactive health measures, remains the most effective approach to mitigating the impact of COVID-19 and safeguarding public health.

Contact Us Today: For more information on comprehensive risk management strategies for your business in the face of evolving COVID-19 variants, contact us for a consultation. Our team of experts can help you develop effective plans to protect your employees and maintain business continuity.