The reason is that because of the ways that different microorganisms take the ways the different microorganisms reproduce and damage cells and tissue within your body, you need different ways to respond to them effectively.
Furthermore, scientists think they understand the steps they need to take to genetically modify pig tissue so that it will not be rejected by the human immune system.
The girl said that in several visits to the toilet in the accident and emergency department she could have undressed herself and did not need help from Mr Thorley to use tissue paper.
If this is the case, you may need prescription antihistamines and nasal sprays, which shrink swollen tissue, as well as corticosteroid nasal sprays, which fight the underlying inflammation.