All the animals used for xenotransplantation experiments at HLS die or are killed. It can be a long exit - a research goal is to keep the animals alive as long as possible after transplant. Clinical conditions are recorded by scientists. Animals are described as quiet, huddled, shivering, unsteady, in spasm, vomiting and suffering from diarrhoea. Some have blood or puss seeping from wounds.
Many deaths are wasteful.
The company's correspondence shows an average of one in five animals lost this way. There is much evidence of shoddy work inside the centre. The documents show animals have been wrongly re-used in experiments, medicines have been left unlabelled and uncapped, and on hundreds of occasions scientists have failed to take readings and measurements from animals following operations. Worse still, there are mistakes which lead to painful deaths. A monkey perished because a swab had been left inside his wound during the operation, causing his spleen to go septic.