“…In addition, it has been shown that mice treated with oestrogen were infected at a higher percentage than those untreated (St Claire et al, 1994). We have satisfactorily reproduced the disease using low-dose oestrogens to synchronise oestrus in nonpregnant BALB/c mice (Soto et al, 2005). Shortly later, we have reproduced bovine tritrichomonosis in pregnant BALB/c mice treated with a low dose of estrogens (Barbeito et al, 2008).…”