The Rise of the Nimbus COVID Variant: What Parents Need to Know This Summer (2025) 

As we settle into the heart of summer, a new COVID-19 variant is making headlines, and parents everywhere have questions. The “Nimbus” variant (NB.1.8.1) has quickly become the dominant strain in the United States, accounting for more than a third of all COVID-19 cases as of early June 2025. Alongside it, another variant, LP.8.1, is also widely circulating. While overall COVID-19 case numbers remain relatively low compared to previous years, a noticeable uptick is occurring in some areas, particularly in southern states where extreme heat is driving people indoors. 

Here’s what you need to know about the Nimbus variant, its symptoms, how it affects children and families, and how to keep your family safe and healthy this summer. 

What Is the Nimbus Variant? 

The NB.1.8.1 or “Nimbus” variant is the latest strain of COVID-19 to rise to prominence. It’s not alone; LP.8.1 is also widespread, but Nimbus has become the leading strain in many regions, including parts of the South and Midwest. The increase in cases isn’t yet cause for panic, but it is a reminder that COVID-19 continues to evolve, and vigilance is still necessary, especially for families with young children or vulnerable members. 

Interestingly, the current rise in cases appears linked to climate: in the hottest U.S. states, people tend to avoid the scorching temperatures by staying indoors in air-conditioned spaces, which creates an ideal environment for respiratory viruses like COVID-19 to spread. Conversely, northern states may see fewer infections due to more outdoor activity during mild summer weather. 

Common Symptoms: What Sets Nimbus Apart? 

COVID-19 symptoms have remained fairly consistent over the years, and Nimbus is no exception, but some signs may be more pronounced with this variant. 

Typical symptoms include: 

• Fever 

• Cough 

• Fatigue 

• Headache 

• Muscle and body aches 

• Runny nose or congestion 

• Loss of taste or smell 

What’s standing out with the Nimbus variant is a particularly intense sore throat, often described by patients as a “razor blade throat.” If your child complains of a very painful throat in addition to other cold-like symptoms, it’s worth considering a COVID-19 test. Some individuals may also experience gastrointestinal symptoms such as nausea, vomiting, and diarrhea, which adds to the challenge of distinguishing it from other seasonal illnesses. 

Is Nimbus More Dangerous? 

The good news: as of now, there’s no evidence suggesting that the Nimbus variant leads to more severe illness than earlier strains. Hospitalization rates have continued to decline nationwide, largely thanks to widespread vaccination and natural immunity from past infections. 

However, COVID-19 can still pose serious risks for certain groups, including older adults, people with underlying health conditions, infants, and anyone with a compromised immune system. While the virus may feel like a mild cold for many, it’s still capable of causing significant illness in vulnerable individuals. 

Are Vaccines Still Effective? 

Yes. Current COVID-19 vaccines are expected to remain effective at preventing serious illness and hospitalization caused by the Nimbus variant. If your family hasn’t yet received their most recent COVID-19 booster, now is a good time to check eligibility and schedule it, especially before back-to-school season arrives. 

Keeping vaccinations up to date helps reduce the likelihood of severe outcomes and also helps to limit community transmission, protecting those who are most at risk. 

What Parents Can Do: Practical Steps for a Safer Summer 

As always, a few common-sense precautions can go a long way toward keeping your family healthy: 

1. Stay Up-to-Date on Vaccines 

Make sure your children, and any other eligible family members, are current on their COVID-19 vaccinations and boosters. 

2. Monitor for Symptoms 

If your child starts experiencing symptoms like fatigue, cough, or especially a painful sore throat, consider using a home COVID-19 test. These tests remain a reliable first line of defense. If your child tests negative but symptoms persist, retesting after 24-48 hours is recommended. 

3. Maintain Good Hygiene Habits 

Encourage frequent handwashing with warm soapy water for 20 seconds, especially before meals and after using the restroom. These simple routines are still among the most effective ways to prevent the spread of illness. 

4. Use Masks Strategically 

While masking isn’t mandatory in most places anymore, it can still offer added protection in high-risk indoor settings. If someone in your household has a weakened immune system, or you’re attending a crowded indoor event, wearing a mask is a good precaution. 

5. Keep Sick Kids Home 

It’s tempting to send kids to camp or daycare with minor sniffles, but if your child is under the weather, it’s better to play it safe. Keeping sick kids home helps stop the spread of illness and protects the broader community. 

Staying Informed 

As public health experts continue to monitor the spread of the Nimbus and LP.8.1 variants, we’ll keep you updated with the latest recommendations and resources. For now, stay informed, stay cautious, and enjoy your summer safely! 

For current data and activity levels in your area, visit: 

• Epic Research COVID Tracker 

• CDC Respiratory Virus Activity Map 

If you have specific concerns about your child’s health or vaccination status, don’t hesitate to reach out to your pediatrician or visit your local PM Pediatric Urgent Care.  

Remember: Staying proactive today helps protect your family tomorrow. Let’s keep this summer safe, fun, and healthy for everyone! 

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