Description and Use

THE ALPHABETICAL DISPLAY

This section of the Thesaurus is a listing of all terms,  both preferred
and non-preferred,  in alphabetical order. 
Each preferred term entry may have one or more of the following parts:
	
	A	VECTORS
	B	SN  Organism which spreads a pathogen from
 		       one host to another
	C	UF  Paternetic Hosts
		       Transfer Hosts
	D	BT  INDIRECT TRANSMISSION
	E	NT  ALTERNATE VECTORS
		       EXPERIMENTAL VECTORS
		       PRIMARY VECTORRS
		       SECONDARY VECTORS
	F	RT  VECTOR-BORNE DISEASES

A	This is the main entry position for the preferred term.  In this position,  it will 
	always be in boldface capital letters.

B	This is the scope note (SN) for the preferred term.  It is used to define and 
	clarify the use of this term.

C	This denotes any Used For (UF) term of an equivalence relationship.  These 
	terms can be synonyms,  near synonyms or quasi-synonyms.  This relationships 
	is used often in this thesaurus for relating trade and generic drug names and 	
	common and Latin organism names.  These are the non-preferred terms which 
	make reference to this preferred term.

D	This indicates terms broader than (BT) the main entry term.  They represent a
	term generic to the main entry term.  Most preferred terms will have only one 
	BT term,  unless they have more than one place in the hierarchical listing.  Use
 	of a BT in searching leads to an increase in recall.

E	This indicates terms narrower than (NT) the main entry term.  They are more 
	specific than the main entry term.  Use of an NT in searching leads to an 		
	increase in precision.  BT and NT are reciprocal relationships.

F	This indicates terms which are related to (RT) the main entry term in a non-	
	generic/non-specific manner.


Each non-preferred term has an entry like the following:

	G	Transfer Hosts
	H	USE  VECTORS

G	This is a non-preferred term.  It is distinguishable from a preferred term by 
	being in regular face and in lowercase letters.

H	This denotes the preferred term which should be used instead of this non-
	preferred term (USE).  UF and USE are reciprocal relationships.


ALPHABETIZATION RULES

This thesaurus uses word by word alphabetization,  according to the following rules:

1.	Nothing comes before something.  Spaces file before characters.

2.	Numerals were ignored unless they were the distinguishing feature of the
 	terms.  If this is the case,  they were filed in numerical order.


USING THE HIERARCHICAL DISPLAY

 This part of the thesaurus displays preferred terms groups as described by the BT-NT
 relationships.  Terms closer to the left hand margin, that is,  those with fewer leader dots 
 are the broader terms.  The more leader dots,  the more specific the term.