I would like to know some examples of chemicals used by snakes like python or any other organism to defend or nurture themselves. I would also to read more about these chemicals; journals or texts references that provide information about these chemicals and organisms would be appreciated.

Following a visit to a physician’s office, the physician wrote the patient a letter informing her that she had a sexually transmitted disease. The patient showed the letter to two or three friends. When the physician came to her home to talk with her about it, a friend was visiting her, and the patient discussed the matter in the presence of the physician and the friend. The patient then sued the physician for breach of confidentiality. Did the physician breach her confidentiality?

Diseases that primarily exist in animals, but may be transmitted to humans are called parasitic symbiotic zoonotic chronic

I believe is portals of exit because is the route by which an infectious aent leaves the host.