Viruses are non-living chemical entities. They are parasites of living cells and can replicate only within living cells by using the cell’s enzyme systems. They have nucleic acid genomes, either DNA or RNA, but not both.
Viruses have a narrow range of cells that they can infect but all or nearly all organisms can be infected by multiple kinds of viruses. There may be as many as 1×10^12 kinds of viruses.
The morphology of viruses is diverse but all have a nucleic acid core surrounded by a protein coat (capsid).
In this educational post, we will present some of the most common viral infections that affect multiple organs.
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