Enhanced antibody response in cattle against Leptospira hardjo by intradermal vaccination.

A commercial killed Leptospira hardjo vaccine (with adjuvant) and non-adjuvanted preparation of the same vaccine were used in comparison of the effectiveness of the intradermal (i.d.) and subcutaneous (s.

gamma delta T-lymphocytes and anti-heat shock protein reactivity in bovine leukemia virus infected cattle.

Bovine leukemia virus (BLV) induces a chronic infection in cattle that may result in persistent lymphocytosis (PL) and, sometimes, enzootic bovine leukosis. The cellular and humoral immune responses of the host following infection have been extensively investigated but little is known about the involvement of gamma delta T-cells in BLV pathogenesis. The affluence of these cells in cattle, and particularly in the peripheral blood of young ruminants, may suggest a particular role for them in defense mechanisms.

A possible linkage between gonadal hormones, serum and uterine levels of IgG of dairy cows.

We have investigated the possible linkage between serum and uterine fluid immunoglobulin G (IgG) levels and the hormonal status of the cow. In cycling cows there was a significant (P < 0.01) drop in average (of 4 consecutive days) serum IgG levels, from 36.