Select the three choices that represent the primary purposes of cultivating viruses.

To study viral structure and replication: Cultivating viruses allows scientists to understand how they are built and how they multiply. This knowledge is crucial for developing treatments and vaccines.

To develop vaccines: By cultivating viruses, scientists can create weakened or dead versions of the virus. These can be used to stimulate the immune system and create immunity, without causing the disease.

For diagnostic purposes: Cultivated viruses can be used to create tests that detect the presence of the virus in a patient. This is crucial for controlling the spread of viral diseases.