1. HIV is transmitted through sexual contact, contaminated needles, blood transfusions, and from mother to child during pregnancy or birth. It attacks CD4 T cells in the immune system. 2. AIDS develops when HIV has destroyed enough T cells to weaken the immune system, making a person vulnerable to opportunistic infections. 3. Some diseases like allergies, cancer, diabetes, asthma, and heart disease are not spread between people but have other causes like genetics, environment, or lifestyle factors.

1. Infectious and Non infectious Diseases

2. Human immunodeficiency virus
It can exist in blood and body fluids

3. 1. Having sexual intercourse with an infected
person
2. Contaminated needles
3. Blood transfusion
4. Pregnant infected woman can pass it to her
child through the placenta
5. Child can also be infected through birth process
or nursing

4. Touching infected person
Handling objects used by the person unless they
have bodily fluids on them
Toilet seat

5. AIDS is Acquired Immune Deficiency Syndrome—a
disease that attacks the body’s immune system,
mainly theT cells
It is caused by the HIV virus

6. The virus enters theT cell and multiplies
So manyT cells are destroyed that the B cells
cannot make antibodies
The immune system cannot fight the pathogens
that enter the body

7. Washing with soap and water
Cleaning the wound with antiseptic
Bandage
Dental floss

8. Diseases that are not spread from one person to
another

9. 1. Allergies
2. Cancer
3. Diabetes
4. Asthma
5. Heart Disease

10. The disease can last for a long time.

11. Lyme disease

12. An overly strong reaction of the immune system to
a foreign substance

13. Substances that cause an allergic response
Examples: chemicals, certain foods, pollen , mold,
dust, cat hair

14. Your immune system usually forms antibodies
Your body releases histamines

15. A lung disorder associated with reactions to
allergens

16. Medications that can be used to treat allergic
reactions and asthma

17. A chronic disease associated with the levels of
insulin produced by the pancreas

18. A group of closely related diseases that result from
uncontrolled cell growth
A complicated disease

19. Cancerous cells can leave a tumor, spread
throughout the body via blood and lymph
vessels, and then invade other tissues

20. Smoking
Chemicals
X-rays
Ultra-violet radiation

21. Know the causes and protect yourself