RT Book, Section A1 Panus, Peter C. A1 Jobst, Erin E. A1 Masters, Susan B. A1 Katzung, Bertram A1 Tinsley, Suzanne L. A1 Trevor, Anthony J. SR Print(0) ID 6094486 T1 Chapter 28. Antiviral Agents T2 Pharmacology for the Physical Therapist YR 2009 FD 2009 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-146043-9 LK accessphysiotherapy.mhmedical.com/content.aspx?aid=6094486 RD 2024/11/12 AB Viruses are obligate intracellular parasites. That is, unlike bacteria, viruses depend on living host cells to replicate and function. Since viruses rely on the synthetic machinery of host cells, viruses can be extremely small. In many cases, the entire viral particle, or virion, consists only of nucleic acids (deoxyribonucleic acid [DNA] or ribonucleic acid [RNA]) surrounded by a protein shell, or capsid. Some viruses have an additional glycoprotein coat called an envelope.