They may exist. Proving that they cause disease, however, is more complicated. What I’ve heard (may be inaccurate) is that they can find viruses in a sick person - but can’t prove the virus caused it. Could’ve been the coffee they drank, could’ve been microbes already inside their body, etc.
It proves these things called viruses exist, unless you can show the images are all fake.
They may exist. Proving that they cause disease, however, is more complicated. What I’ve heard (may be inaccurate) is that they can find viruses in a sick person - but can’t prove the virus caused it. Could’ve been the coffee they drank, could’ve been microbes already inside their body, etc.