Explain what course of action Australian authorities may take for a person wanting to re-enter Australia after visiting Kivu during the epidemic, and state why this action would be taken

1. Screening: Upon arrival in Australia, the person would be subjected to health screening. This is to check for any symptoms of illness that may have been contracted in Kivu, especially if there was an epidemic during their visit.

2. Quarantine: If the person shows symptoms of illness, they may be placed in quarantine. This is a precautionary measure to prevent the potential spread of disease within Australia. The length of the quarantine would depend on the nature of the epidemic in Kivu.

3. Medical Examination: The person may be required to undergo a thorough medical examination. This could involve blood tests, scans, or other diagnostic procedures to determine whether they have contracted any diseases.

4. Vaccination: Depending on the nature of the epidemic in Kivu, the person may be required to receive certain vaccinations upon their return to Australia. This would be to protect them, as well as others, from potential infection.

5. Monitoring: Even if the person does not show symptoms of illness, they may be asked to self-monitor for a certain period and report any health changes to the authorities. This is because some diseases have an incubation period and symptoms may not appear immediately.

6. Travel History: The person's travel history would be recorded and they may be asked to provide details of their activities in Kivu. This information could be used for contact tracing if necessary.

The main reason for these actions is to protect public health in Australia. By identifying and managing potential health risks at the earliest opportunity, the authorities can help to prevent the spread of diseases within the country.