TABLE 1.

Numbers of lymphocytes, CD4⁺ T cells, and CD4⁺ CD25⁺ T cells in the popliteal and inguinal lymph nodes of vaccinated and vaccinated and challenged mice with or without treatment with anti-p19 antibody

Treatmenta	No. of lymphocytes/nodeb	No. of CD4+ lymphocytes/nodec	No. of CD4+ CD25+ lymphocytes/nodec
Nonvaccinated	1.2 × 106	2.2 × 105	5.7 × 104
Vaccinated	1.9 × 106	2.1 × 105	4.4 × 104
Vaccinated and treated with anti-p19	0.9 × 106	0.1 × 105	2.1 × 104
Vaccinated and challenged	6.1 × 106	3.7 × 105	1.1 × 105
Vaccinated, challenged, and treated with anti-p19	7.4 × 106	5.5 × 105	1.3 × 105

^aEighteen to 24 popliteal and inguinal nodes were collected from 5 to 6 mice per group 8 days after infection. Single-cell suspensions in PBS were obtained, and cells were counted with a Petroff-Hauser counting chamber.

^bObtained by multiplying the percentage of lymphocytes by the average number of cells/node.

^cObtained by multiplying the percentage of CD4⁺ or CD4⁺ CD25⁺ lymphocytes by the average number of lymphocytes/node.