**Abstract**

Our planet since development has experienced a greater perspective of growth. Constituting millions of species exhibiting different kinds of relationships producing both correlational and mutual growth, sums up to the widespread evolutional changes we see today. Mankind as a separate entity within the avalanche of species plays a greater share of the role and thus contributes greatly to the growth and existence of this planet. After having to battle with intraspecies 'fight and survive' relation within his colony conditioning him into psychological, social, and emotional, problems; he unquestionably relates with other species in an interspecies relationship. Though this interspecies relationship does not produce only negative outcomes and raises positive outcomes as well, a great deal of it is a threat to mankind's survival and growth. One interspecies relationship that mankind experiences mutual benefits is that with plants and with species such as those of some virus, bacterial, protozoans, etc., he experiences a parasitic relationship with a lot of negative outcomes. The chapter "Plant and Infectious Diseases," explore the relationship between man and plants that heals him and his relationship with other kinds of species that renders him into illness. It talks about how plants can help us remedy infectious diseases.

**Keywords:** plants and infectious diseases, plants metabolites, plant medicine, phytomedicine, viral infections, protozoa infections, fungi infections, bacterial infections
