Which affects the structure or functions of human being with specific symptom is called disease or disorder.
A communicable disease is an illness that is transmitted from a person , animal , or inanimate source of another person either directly , with the assistance of an intermediate host or by a vector. communicable disease present in an epidemic, endemic and pandemic .
1. Incubation period
The time taken to show the first clinical symptoms to appear after infection.
Any living carrier that carries and transfers an infectious agent into another living organism is known as vector. E.g: Flies, Mosquito.
Separation of an infected organism, after the development of infection, From other organism, For a period of communicability.
A person or an animal harbours the infectious agent.
A communicable disease which is caused by an Infection.
Is the invasion and multiplication of disease-causing agents, which leads the tissue damage.
7. Infectious agent
All infection causing agents are known as infectious agents. E.g : Virus, Bacteria, Nematodes, Arthropods etc.
Is the process of spreading the infection from one medium to another medium. E.g: Touch, inhalation, sexual contact, infected discharges.
9. Contagious disease
It means capable of being transmitted from one human to another human via direct or indirect contact. E.g : Measles
Is the study of distribution and determinates of disease conditions among the populations.
· Water borne diseases
· Air borne diseases
· Disease Transmitted through Parasites
· Disease Transmitted through Arthopods
· Disease Transmitted through Animals
· Disease Transmitted through Contact.