: difficult in a way that is usually interesting or enjoyable. Thesaurus: All synonyms and antonyms for challenging Nglish: Translation of challenging for Spanish speakers Britannica English: Translation of challenging for Arabic speakers.
To illustrate the tremendous indirect impact of emerging zoonotic diseases on public health policy and structures and on public perception of health risks, the authors provide a number of examples, including that of the Ebola virus, avian influenza, monkeypox and bovine spongiform encephalopathy.
Given that 75% of all emerging infectious diseases are zoonotic, it is likely that diseases like avian influenza and future novel pathogens will continue to evade early detection systems and the vaccination preparation processes currently in place (Centers for Disease Control and Prevention, 2013).