Which of the following was a major development in 1931 that helped in the production of antiviral vaccines?

Name: Which of the following was a major development in 1931 that helped in the production of antiviral vaccines?
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The ability to grow viruses in chicken eggs was a major development in 1931 that helped in the production of antiviral vaccines. This process, called embryonated egg culture, allowed researchers to mass-produce viruses and develop vaccines more efficiently.

Which of the Following Was a Major Development in 1931