Final answer:
To break the first link of the chain of infection, the causative agent, you can isolate the infected individual, improve personal hygiene, and vaccinate the population.
Step-by-step explanation:
The first link of the chain of infection, the causative agent, can be broken through various measures. These include:
- Isolating the infected individual to prevent the spread of the infection to others.
- Improving personal hygiene, such as frequent hand washing, to reduce the transmission of pathogens.
- Vaccinating the population to build immunity and prevent the spread of the causative agent.
Administering antibiotics may be effective in treating certain infections caused by bacteria, but it does not directly break the chain of infection as the causative agent may still be present in the individual.