Viruses are among the smallest infectious agents proteins are essential to life cells produce new protein molecules from amino acid building blocks based on information coded in dna each type of protein is a specialist that usually only performs one function so if a cell needs to do something new it must make a new protein viruses force the cell to make new proteins that the cell . Because of the extensive use of viruses in cell biology research and their potential as therapeutic agents we describe the basic aspects of viral structure and function in this section viral capsids are regular arrays of one or a few types of protein the nucleic acid of a virion is enclosed within a protein coat or capsid composed of multiple copies of one protein or a few different . In practice this is usually manifest as an observable viral disease with characteristic non life threatening first symptoms o viruses then are dense information rich polynucleotide macromolecules of 3000 bp sanjuan 2010 2012 sanjuan and domingo calap 2016 they are in a sense in susceptible host cells condensed regulatory . Good ventilation is essential in preventing the spread of airborne viruses in modern hospitals high tech ventilation systems turn over the air at a high rate to prevent the spread of infection natural ventilation using doors and windows can also be helpful in some situations particularly residential areas where pollution or insects are not a concern
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