According to the research, viral diseases are difficult to treat because viruses are constantly changing.
They are infectious diseases that are caused by an infectious agent called a virus, which is a very simple microorganism that infects cells.
These are difficult to treat because virus mutations occur due to random errors in the replication of their genome when they multiply inside the cell.
Therefore, we can conclude that according to the research, viral diseases are difficult to treat because viruses are constantly changing.
Learn more about viral infections here: https://brainly.com/question/25757486
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