New research on viruses suggest some form "packs" and hide inside spherical sheathes to hide from view until ready to attack.
Quote:
It had been thought viruses were all lone wolves, each on a solo campaign of infection.
Instead they can form "packs" of up to 40 viruses and surround themselves with a fatty sphere that makes them invisible to our body's defences.
Experiments, published in the journal Cell Host and Microbe, showed the spheres gave the viruses huge advantages.
The spheres acted like an invisibility cloak that prevents the immune system spotting the viruses
The spheres protected the viruses from harsh environments including stomach acid
And they helped viruses reach their target in larger numbers and overwhelm cells in the intestines
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https://www.bbc.co.uk/news/health-45114842
Sounds like some rich new material for our manga-ka, especially the "invisibility cloak."