What do we know about the Covid-19 virus five years on? New Variants
- Shidonna Raven

- 2 hours ago
- 1 min read
By Rachel Hall
August 7, 2025
Source: Oncology Nurse
Photo / Image Source: Unsplash,
Which variant are we on now?
The main Covid viruses in circulation are the Omicron subvariants. These are “obviously milder than Wuhan or Delta”, Altmann said, adding it’s not the case that they are becoming progressively milder, but rather population immunity is higher owing to vaccines and prior infections.
The newest variant, NB.1.8.1, has been detected in the UK and international data suggests it is growing as a proportion of all Covid cases. World Health Organization analysis found the new strain is more contagious, but vaccination gives significant protection.
Williams said we can expect to keep seeing the virus evolve, similar to how there are new flu virus combinations each year.
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