Module 5—Qualifiers (Subheadings)

Common Qualifier Coordinations

• When it is known that Disease A causes Disease B
  
  • 650 _2 $a Disease A $x complications
    
  • 650 _2 $a Disease B $x etiology
  
  
• When two diseases are associated, but cause and effect is not established
  
  • 650 _2 $a Disease A $x complications
    
  • 650 _2 $a Disease B $x complications
  
  
• When a drug or technique causes an adverse reaction
  
  • 650 _2 $a Disease $x chemically induced
    
  • 650 _2 $a Drug $x adverse effects
    OR
    
  • 650 _2 $a Disease $x etiology
    
  • 650 _2 $a Technique $x adverse effects
  
  
• Use of a particular drug in treatment of a disease
  
  • 650 _2 $a Disease $x drug therapy
    
  • 650 _2 $a Drug $x therapeutic use
  
  
• The effect of a drug on an organ or organism
  
  • 650 _2 $a Organ $x metabolism
    
  • 650 _2 $a Drug $x pharmacology
    OR
    
  • 650 _2 $a Organism $x metabolism
    
  • 650 _2 $a Drug $x pharmacology
  
  
• If using the qualifier mortality on a topical descriptor coordinate with a geographical descriptor using the qualifier epidemiology if relevant
  
  • A work on mortality statistics for RNA virus infections in Japan
    
    • 650 _2 $a RNA Virus Infections $x mortality
      
    • 651 _2 $a Japan $x epidemiology
    
    

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