Organisms that are so small that they can only be seen with a microscope.

Contains chemicals that can wash away and kill certain organisms.

A disease that can pass from one organism to another.

A technique that can reduce the chance of catching a disease by direct contact.

Contains white blood cells, antibodies, and helps to protect your body against an invading pathogen.

A kind of medicine that protects you from a disease.

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Immunity

Science 4th grade immunity

Terms	Definition
Microorganisms	Organisms that are so small that they can only be seen with a microscope.
Skin	Bodies first line of defense
Tears	Contains chemicals that can wash away and kill certain organisms.
Pathogen	Organisms that cause diseases.
Infectious disease	A disease that can pass from one organism to another.
Hand washing	A technique that can reduce the chance of catching a disease by direct contact.
Immune system	Contains white blood cells, antibodies, and helps to protect your body against an invading pathogen.
Vaccine	A kind of medicine that protects you from a disease.