If you stop the virus directly, ignoring the immune system, you don't get those symptoms.
AgNPs do that to viruses.
The virus must stick to the victim/host cell membrane...
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Quantum Mechanics (QM) precludes non-integer valences.
The problem is resolved by silver atoms having one valence part of the time, and another...
That's how catalysts work, and it plays hell with enzymes, esp binding enzymes viruses use to stick to human cell membranes.
Maybe AgNPs should be called "NanoSwarms", because they're never at-rest and yet...
A single silver atom is 0.29nm in diameter. That's a million times smaller than 0.29mm.
Binding enzymes are huge in comparison.
I have ZERO vested interest in ANY company or product.
This is free advice from a retired scientist, 12 yrs as Dir of BioMed R&D.
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The AgNPs in water is called "colloidal silver".