Which of the following is true regarding cultivation and isolation of animal viruses?
a. Diploid cell culture lines, developed from human embryos, are widely used for culturing viruses that require a human host.
b. The preferred and widely used method of viral isolation and growth is via growth in an embryonated egg.
c. Mouse models are available for virtually all human viral infections and can be routinely used for vaccine development.
d. Viruses can be easily grown in liquid culture without any other organisms present.
Answer: a. Diploid cell culture lines, developed from human embryos, are widely used for culturing viruses that require a human host.
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