Benchmark 6E
The Human Organism: Physical Health
Grades 3-5, page 144

If germs are able to get inside one's body, they may keep it from working properly. For defense against germs, the human body has tears, saliva, skin, some blood cells, and stomach secretions. A healthy body can fight most germs that do get inside. However, there are some germs that interfere with the body's defenses.

NSES Content Standard F 
Science in Personal and Social Perspectives: Personal health
Grades K-4, page 140
Individuals have some responsibility for their own health. Students should engage in personal care--dental hygiene, cleanliness, and exercise--that will maintain and improve health. Understandings include how communicable diseases, such as colds, are transmitted, and some of the body's defense mechanisms that prevent or overcome illness.

NSES Content Standard C 
Life Science: Structure and function in living systems
Grades 5-8, page 156
The human organism has systems for digestion, respiration, reproduction, circulation, excretion, movement, control and coordination, and for protection from disease. These systems interact with one another.