LP-BM5 retroviral infection increased Ab production. LP-BM5 retroviral infection increased Ab production. ELISA data measuring levels of (A) total Ig, (B) IgM, (C) IgG2c, and (D) IgG3 in spleens from naive and LP-BM5–infected mice directly ex vivo. Numbers of (E) GC B cells and (F) Ab-secreting cells. Data shown in (A)–(F) are from a representative experiment, with a similar pattern of results observed in three experiments. **p < 0.01, ***p < 0.001. Jessica L. Rastad, and William R. Green ImmunoHorizons 2018;2:87-106 Copyright © 2018 The Authors