Infectious diseases are caused by pathogenic microorganisms, for example, microscopic organisms, infections, parasites or growths; the illnesses can be spread, directly or by implication, starting with one individual then onto the next. Zoonotic illnesses are irresistible maladies of creatures that can make sickness when transmitted human body. These diseases include Hepatitis A, B, C, Malaria, Measles, Poliovirus, Pneumonia, Syphilis, Zika virus and Congo virus etc. Some of these can be transferred from person to person. But on the other hand, it is not always a necessary factor. Some of them also transfer from the bite of insects and animals just like Congo virus. Another source of transmission of infectious diseases is contaminated water too. These infections can be mild or life-threatening as well.