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6. It is important to use antibiotics carefully because:
- antibiotics are very expensive
- it reduces the spread of resistant strains
- it reduces the spread of resistant strains
7. Which of the following is a function of antibodies?
- To engulf pathogens
- To lock on to antigens
- To produce toxins
8. Which of these is one of the main problems with viruses?
- They damage the host cell when they reproduce
- They cause cholera and typhoid in refugee camps
- They are killed by antibiotics
9. What can vaccination involve?
- Injecting a dead form of the disease to stimulate immunity
- Injecting an inactive form of the pathogen to stimulate immunity
- Injecting an inactive form of the disease to stimulate immunity