Final answer:
Pathogens are organisms that cause infectious diseases.
Step-by-step explanation:
Infectious diseases are caused by microorganisms such as bacteria, viruses, fungi, or parasites. These organisms, known as pathogens, invade the body and cause disease. They can be transmitted from person to person through various means such as direct contact, air droplets, contaminated food or water, or through vectors like mosquitoes or ticks.
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