Nutrient deficiency allows viruses a foothold

Why don't we get a cold or flu in summer? They tell us that catching a cold has nothing to do with being cold. It has lots to do with the body making its own antibiotics but these work on viruses where pharmaceutical antibiotics cannot affect a virus at all. These natural disease fighters are called antimicrobial peptides and the body makes them IF....I say ONLY IF we get enough Vitamin D. In summer we get more sunlight which causes the body to make this nutrient. How many other viruses could we be protected from if we got enough nutrition? How about HIV? smallpox? measles? Ebola? hanta? these antimicrobial peptides drill right through the impenetrable virus shell and destroy them. This leads me to wonder something. Since peptides are small molecules that hold amino acids together in a protein chain, could these be manufactured or rather separated out, and concentrated in the lab so that these antimicrobial peptides could be given to plants, animals, and humans to combat every kind of virus. Well that could be the next twenty years of research but I don't want to wait, getting more sunlight gives me more vitamin D and that is what I plan to do. Here is the video that told me about this:
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Your wealth IS your health but money is nice too
Doug