Wiki Sumber Informasi iSIKHNAS

• Infectious agent: living organisms that are capable of causing disease in susceptible animals. Infectious agents include: bacteria, viruses, parasites, protozoa, and fungi.
• Infectious disease: A disease due to a specific infectious agent that occurs due to transmission of the agent from an infected host to a new host, either directly or indirectly through intermediate hosts, vectors, or the environmental.
• Contagious disease: A contagious disease is an infectious disease that can spread directly from animal to animal. All contagious diseases are infectious but not all infectious diseases are contagious.