**5. One Health concept**

The One World, One Health theory represents that the health of all living things present on this planet depends upon the health of other living things [22]. To survive in this world now, we should consider the planet as a dynamic system, in which the health of each component is linked and reliant on others [23]. If we want to control human diseases, we should also consider the diseases of animals. Nearly 60% of human infectious diseases is from animal origin and 75% of the emerging infectious diseases of humans reported during the last 30 years is of animal origin too [24].

Several emerging infectious zoonotic diseases have arisen as a threat to food supply and the control of these diseases needs the collective expertise [25]. As human population is growing day by day, interaction between the people and wild animals is also increasing. This exposes human to diseases [26]. Ebola and AIDS are two major examples that possibly transmitted from chimpanzees to humans [24]. One Health gives a noteworthy chance to veterinarians to cooperate with human medical experts, wildlife, and environmental health professionals for the greater good [27].
