† retrovaccinatev.

1839 Brit. & Foreign Med. Rev. 8 615 It is, however, not so easy to retro-vaccinate from the human subject, as he [sc. Ceely] had learned from many experiments.

1840 R. Ceely in Trans. Provinc. Med. & Surg. Assoc. 8 366 These experiments are neither intended nor calculated to illustrate the best mode of vaccinating or retro-vaccinating the cow.

1890 Lancet 28 June 1434/2 The society to which we refer argues that..there is no certainty that the calf has not been retro-vaccinated from the human subject and had human diseases communicated to it.