What is vaccine

Options

A. Treated bacteria, virus & protein
B. Treated algae
C. Treated fungi
D. Treated plasmodium

Answer

**Step-by-Step Solution:**

1. **Definition of Vaccine**: A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. It typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins.

2. **Components of Vaccines**: Vaccines can be made from:
- Treated bacteria
- Treated viruses
- Proteins derived from these pathogens

3. **Function of Vaccines**: The primary function of a vaccine is to stimulate the immune system to recognize and fight pathogens. When a vaccine is administered, it prompts the body to produce antibodies, which are proteins that help to neutralize or destroy pathogens.

4. **Historical Context**: The first vaccine was developed by Edward Jenner in 1796 against smallpox, using material from cowpox lesions. This historical context highlights the importance of vaccines in controlling infectious diseases.

5. **Types of Diseases Treated**: Vaccines are primarily used to prevent diseases caused by bacteria and viruses. They are not typically used for diseases caused by fungi or algae, which are treated with antibiotics or other medications.

6. **Conclusion**: Based on the information provided, the correct answer to the question "What is a vaccine?" is option A: treated bacteria, viruses, and proteins.