What are the common diseases in humans? What is common cold? What are the symptoms of common cold? What is dengue fever? What is polio and what is chikungunya? This video will help you to find all the answers.
Human Health and Diseases (Part 1)
All parasites are pathogens as they cause harm to the host by living in (or on) them. The pathogens can enter our body by various means, multiply and interfere with normal vital activities, resulting in morphological and functional damage. Pathogens have to adapt to life within the environment of the host.