Across
- 3. an immune cell that can engulfs and digests pathogen
- 5. a method to prevent diseases by injecting(注射) weakened pathogens
- 6. a chemical that is produced by lymphocyte and destroy(毁灭) pathogen by binding with (结合) antigen
- 9. the ability of the body to resist(抵抗) a specific pathogen
- 10. a microorganism that causes disease
- 12. the entry(进入) of a pathogen into the body of an organism
Down
- 1. feature特征 that you experience when you have a disease
- 2. lost of much water because of a severe(严重的) diarrhea
- 4. a chemical that contains dead or weakened pathogens that is injected(注射) into body to induce(引起) an immune response
- 7. a poisonous(有毒的) substance; a chemical that damages cells
- 8. an organism in which a pathogen lives and reproduces
- 11. a chemical(化学物质) that is recognised (识别)by the body as being "foreign"(外源物质) and stimulate(刺激) the production of antibody