The number of pathogens known to infect humans is ever increasing. Whether such increase reflects improved surveillance and detection or actual emergence of novel pathogens is unclear. Nonetheless, infectious diseases are the second leading cause of human mortality and disability-adjusted life years lost worldwide [1-2]. On average, three to four new pathogen species are detected in the human population every year . Most of these emerging pathogens originate from nonhuman animal species.
Via Mel Melendrez-Vallard, Dr. Stefan Gruenwald