Table 1.

Examples of classes of vaccine formulations.

Class	Subclass	Example/referencea
Live vaccine	Passaging	PRRSV, human polio
	Cold-adapted/temperature sensitive	Equine influenza [18]
		Equine herpesvirus [6]
	Vector	Bovine adeno-FMDV [126]
	Deletion mutant	Bovine herpesvirus-1 [31]
	Chimera	Aujeski-CSFV [69]; WNV-yellow fever virus [21]
Inactivated	Whole virus	FMDV, AI
	Subunit	African horse sickness VP2 [24]
	Split virion	Human influenza
	Expression	CSFV [66]

This table serves as an example of currently used vaccine formulations and is not meant to be a complete list.

^aSee text and reference for abbreviation and detail.