Columbia subject headings:
Communicable diseases.
Diseases--Causes and theories of causation.
Pathogenic bacteria.
Pathogenic microorganisms.
Harvard subject headings:
Communicable diseases
Diseases--Causes and theories of causation
Pathogenic bacteria
Pathogenic microorganisms
Princeton subject headings:
Communicable diseases.
Diseases--Causes and theories of causation.
Pathogenic bacteria.
Pathogenic microorganisms.