(Capcom's primary storyline)
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The "Immortality virus" was a mutagen developed by Alex Wesker, under the authority of Oswell E. Spencer. While the virus' completion was announced, Spencer never received a sample, and so concluded that his trusted friend had finally betrayed him.
In reality, Alex failed to develop this virus due to the difficulties she had on the experiment. Instead Alex switched to create something else, while making various fake reports to Spencer in order to pacify him. Once she finished her goals, she and her subordinates fled without leaving a trace.