One class is a subtype of another class if all the operations of the second class of object also apply to objects of the first type - perhaps in a different way. Subtypes shown by the generalization arrow that has an open arrow head. T U V

In the hierarchy of user-defined datatypes, a subtype is always a dependent on its supertype.

A classification of virus among influenza types A viruses. Currently, there are 15 subtypes of type A influenza.

Variation of a basic chart type. Back to the top

a distinct form of a microorganism.

Different strains of HIV which can be grouped according to their genes.

(Also called clade) For HIV, a classification scheme based on genetic differences among isolates.

also referred to as clade, a group of related HIV variants classified according to degree of genetic similarity