Suggest and explain how the viruses became able to infect other species of frog.

Name two techniques the scientists may have used when analysing viral DNA to determine that the viruses were closely related.

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Determining the genome of the viruses could allow scientists to develop a vaccine.

Explain how.

Describe how the B lymphocytes of a frog would respond to vaccination against Ranavirus.

You can assume that the B lymphocytes of a frog respond in the same way as B lymphocytes of a human.

Do not include details of the cellular response in your answer.