A communicable disease, also known as an infectious disease, is an illness caused by an infectious agent or pathogen that can be transmitted from one person to another, directly or indirectly. These diseases can spread through various means such as respiratory droplets, contaminated food or water, contact with infected individuals, or vectors like mosquitoes or ticks. Here are some examples of communicable diseases:
1. Influenza (Flu): A viral infection that affects the respiratory system and spreads through respiratory droplets when an infected person coughs or sneezes.
2. Tuberculosis (TB): A bacterial infection that primarily affects the lungs but can also affect other parts of the body. It spreads through the air when an infected person coughs or sneezes.
3. COVID-19: A viral respiratory illness caused by the SARS-CoV-2 virus. It spreads through respiratory droplets when an infected person talks, coughs, or sneezes, and can also spread by touching contaminated surfaces.
4. HIV/AIDS: A viral infection that attacks the immune system, transmitted through sexual contact, sharing needles, or from mother to child during childbirth or breastfeeding.
5. Malaria: A parasitic disease transmitted through the bite of infected mosquitoes. It is prevalent in tropical and subtropical regions.
6. Hepatitis B: A viral infection that affects the liver and spreads through contact with infected blood, unprotected sex, or from mother to child during childbirth.
7. Measles: A highly contagious viral infection that spreads through respiratory droplets. It causes a characteristic rash and can lead to severe complications.
8. Cholera: A bacterial infection that causes severe diarrhea and dehydration. It spreads through contaminated food or water.
9. Zika virus: A viral infection transmitted primarily through the bite of infected mosquitoes. It can also spread through sexual contact or from mother to child during pregnancy.
10. Ebola: A severe viral infection with a high fatality rate. It spreads through direct contact with the blood or bodily fluids of an infected person or through contact with contaminated objects.