TABLE 1.

Agglutination with Vi-specific antiserum^a

NaCl concn (M)	Agglutination of strain
	Ty2	CVD 908-htrA	CVD 909
0.17	+++	+++	++++
0.3	+++	+++	+++
0.5	−	+/−	+++
0.6	−	−	+++
0.7	−	−	+++

^a−, no agglutination; +/−, weak agglutination; +++, strong agglutination; ++++, very strong agglutination.