A Manual of Animal Vaccination; Preceded by Considerations on Vaccination in General (Paperback)

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. Excerpt from book: Section 342 textit{HUMAN VACCINATION. to be dumb; and concerning what in this species, experiment until now has been so slightly communicative, it does not follow that its sentence should be final. However it may be, we are compelled for the present, and we are sorry for it, to consider the theory of uni- city as simply a hypothesis. A respectable hypothesis however, for there is no other that gives so well, a key to the complex problem of which we have been seeking the solution. H U.man Vaccixatiox. 16. The inoculation of vaccine in the human race, whether it come from a child, or whether it be borrowed from ahorse or a cow, is called vaccination. In the first case it is textit{human vaccination; in the second, textit{animal vaccination. We practise the first by borrowing the vaccine matter from one subject for another belonging to the human species. Whilst every individual, whatever his age, may with very few exceptions, be capable of receiving vaccine a first time, and of reproducing it, it is generally in children that we seek this reproduction for the purposes of vaccination. There are two reasons for this: the first, that the fine skin of young subjects lends itself more readily to the normal development of the vesicle; the second, that we know, pretty certainly, that we have to do with fresh subjects?that is to say, subjects submitted to a primary impregnation, which is not the case in individuals of greater age. In the latter, an attack of vario- loid or a previous vaccination not having left any appi- rent traces, may mislead us. - textit{CHOICE OF VACCINIFER. 43 Then, experience has shown that vaccination under these conditions gives origin only, most frequently, to an enfeebled virus, though the vesicles themselves apparently have a normal aspect and development. Vhen we speak t...