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When Jenner developed the first vaccine he was using the observation of milk maids who After having cowpox they were immune to smallpox After having chickenpox they were immune to smallpox After being
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When Jenner developed the first vaccine he was using the observation of milk maids who After having cowpox they were immune to smallpox After having chickenpox they were immune to smallpox After being infected with the flu virus they were immune to smallpox After developing HIV they were immune to smallpox

User Pfhayes
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Answer:

After having cowpox they were immune to smallpox

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User Eric Wright
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