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For all their simplicity, viruses are sneaky little life forces. Take SARS-Cov-2, the virus behind Covid-19. Challenged with the human immune system, the virus has gradually reshuffled parts of its genetic material, making it easier to spread among a human population. The new strain has already terrorized South Africa and shut down the UK, and recently popped up in the United States. The silver lining is that our existing vaccines and antibody therapies are still likely to be effective against the new strain. But that’s not always the case. “Viral escape” is a nightmare scenario, in which the virus mutates just enough so that existing antibodies no longer recognize it. The consequences are dire: it means that even if you’ve already had the infection, or produced antibodies from a vaccine, those protections are now kneecapped or useless.

South africaUnited statesUnited kingdomTeresa przytyckaNational institute of healthYoo ah kimNational instituteBenhur leeBrian hieMad libsஒன்றுபட்டது மாநிலங்களில்ஒன்றுபட்டது கிஂக்டம்தேசிய நிறுவனம் ஆஃப் ஆரோக்கியம்தேசிய நிறுவனம்பென்ஹூர் லீபிரையன் ஹை