In a May 2006 blog entitled “Bird Flu,” we made several points about DDC treatment of influenza A (H5N1) that apply also to DDC treatment of 2009 Influenza A (H1N1). The key point is that “the DDC medicine schedule does not make fine distinctions based on the type of virus nor on the origin of the virus; rather, it treats all influenza in a particular animal the same.” The comprehensive number in medicine for influenza in humans (the number with the Relative Index entry “Influenza—medicine”) is 616.203 Influenza. That is true regardless of what kind of virus causes the influenza. An example of a work classed in 616.203 is Influenza.
Works discussing details about one or more types or subtypes of viruses that cause influenza in humans are classed in 616.203019 Medical virology of influenza (built with 616.203 Influenza plus notation 019 Medical virology from the add table under 616.1–616.9 Specific diseases, following the footnote instruction at 616.203, “Add as instructed under 616.1–616.9”). An example of a work classed in 616.203019 is Influenza Virology: Current Topics.
Works about use of drugs to treat influenza in humans are classed in 616.203061 Drug therapy for influenza (built with 616.203 Influenza plus notation 061 Drug therapy from the add table under 616.1–616.9 Specific diseases, following the footnote instruction, “Add as instructed under 616.1–616.9”). An example of a work classed in 616.203061 is Zanamivir for the Treatment of Influenza in Adults: A Systematic Review and Economic Evaluation.
Incidence of influenza in humans and vaccination to prevent influenza in humans are both classed in 614.518 Influenza. How does one know? The first clue is obvious: the Relative Index entry “Influenza—incidence” leads to 614.518. The second clue is more subtle. The Relative Index entry “Vaccination—disease control” leads to 614.47 Immunization, which has the note: “Class here vaccination.” Above 614.47 in the hierarchy, at 614.4 Incidence of and public measures to prevent disease, is the see reference: “For incidence of and public measures to prevent specific diseases and kinds of diseases, see 614.5.” The see reference has hierarchical force; consequently, works on immunization for a specific disease are classed with the disease under 614.5 Incidence of and public measures to prevent specific diseases and kinds of diseases. There are also other clues. If one follows the Relative Index entry “Vaccines—pharmacology” to 615.372 Vaccines, one finds the class-elsewhere note: “Class use of specific vaccines with the disease in 614.5, e.g., use of influenza vaccines 614.518.” If one looks at the add table under 616.1-616.9 Specific diseases and considers using notation 05 Preventive measures, one finds the class-elsewhere note: “Class public measures for preventing a specific disease, use of specific vaccines with the disease in 614.5, e.g., mosquito control for prevention of malaria 614.532, use of influenza vaccines 614.518.” Examples of works classed in 614.518 Influenza are Global Spread of the Avian Flu: Issues and Actions and Immunization Safety Review: Influenza Vaccines and Neurological Complications.
Comprehensive works on drug therapy and vaccination for influenza in humans are classed in 616.203061 Drug therapy for influenza. How does one know? The first indication is the Relative Index entry that marks 616.203 as the comprehensive number in medicine for influenza: “Influenza—medicine.” Second, see references mark 616+ as logically superordinate to 614.5+. At 616 Diseases is a see reference to 614.4: “For incidence of and public measures to prevent disease, see 614.4.” The see reference implies that 614.4 is logically a subdivision of 616. The see reference from 614.4 to 614.5 quoted above similarly indicates that 614.5 is logically a subdivision of 614.4. In other words, 616 is superordinate to 614.4, which in turn is superordinate to 614.5. Because see references have hierarchical force, what is true of 616 is also true of 616.203061. Because of the hierarchical relationships marked by see references, the first-of-two rule does not apply to a choice between 614.518 and 616.203061. An example of a work classed in 616.203061 is Combating the Threat of Pandemic Influenza: Drug Discovery Approaches.