allergies - reactions to certain substances, noncommunicable diseases - illnesses that cannot be spread, communicable diseases - illness that CAN be spread, pathogens - germs that can cause disease, bacteria - tiny one-celled living things, viruses - tiny particles that can make more of themselves only inside living cells, immune system - the body system that protects against disease, antibodies - substances made by certain blood cells that can destroy harmful pathogens,

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