Diseases that can't be spead from one person to another are ___________ diseases.

non-contagious?

The body's reaction to a normally harmless substance it a(n)__________.

vaccine
fever
allergy
disability

What do you think the answer is?

fever

i know it's not vaccine or disability.

You get a fever when your body reacts to an infection -- which is not normally a harmless substance.

http://www.nlm.nih.gov/medlineplus/ency/article/002229.htm

Thank you for your help.

You're welcome.

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Diseases that cannot be spread from one person to another are referred to as non-communicable diseases. These diseases are not caused by infectious agents such as bacteria or viruses, and therefore, they cannot be transmitted directly from one individual to another. Examples of non-communicable diseases include cardiovascular diseases, cancer, diabetes, chronic respiratory diseases, and some mental health disorders.

Non-communicable diseases can be caused by various factors such as genetics, lifestyle choices, environmental factors, and underlying health conditions. To verify if a disease is non-communicable, you can consult reputable medical sources like the World Health Organization (WHO), Centers for Disease Control and Prevention (CDC), or other health organizations dedicated to providing accurate information about diseases.