It has been found that blood can be transmitted only between animals that are closely related. The degree of relationship between these animals is determined by what is known as the serological evidence. There are various methods of doing so; the method employed by George Nuttall is called the precipitation method.
Blood transmission is only possible between closely related animals. The degree of relationship is determined by serological evidence. Various methods exist to assess this; George Nuttall's method is known as the precipitation method.