An illness that stays below the surface of clinical detection. A subclinical disease has no recognizable clinical findings. As distinct from a clinical disease which has clinical signs and symptoms that can be recognised. Many diseases are subclinical before surfacing as clinical diseases. For examples: diabetes, hypothyroidism, rheumatoid arthritis.
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All viruses can cause a "disease" in some way. They are parasites and thus by definition harmful to their ... many human viruses are so specialized to infect humans that they cause mild and subclinical infections that normally go unnoticed - there is no real use for most viruses ...
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