Notice also how the new version here implies this has ALWAYS been the case. It wasn't simply updated, like they learned something new and changed it. The old definition includes the bodies natural abilities that have always been present and still are, in favor of the notion that ONLY vaccines can create herd immunity. This is an example of lying and sowing confusion, by presenting something as fact and part of the 'settled science' the CDC prefers.
THE DEFINITION OF HERD IMMUNITY WAS CHANGED ON NOVEMBER 13TH 2020 TO SUPPORT VACCINE REGIMENS.
Definitions like these are basically supportive sales literature. They are creating 'job security' for the pharmaceutical industries vaccine marketing strategy. According to this new definition you can't be safe or well without saviors like the CDC to provide you with their advice, and they are 'advising' you that vaccines are the only solution. What's worse, the CDC wants you to believe that you cannot live without them, which is total nonsense.
The first vaccine was introduced by British physician Edward Jenner, who in 1796 used the cowpox virus (vaccinia) to confer protection against smallpox, a related virus, in humans. The vaccine salesmen at the CDC would rather you didn't bring up the fact that vaccines are a fairly recent medical option, and have only been around for about 220 years. They don't want to you to think about it hard enough to ask the obvious question here which is; "How could the human race possibly have managed to survive and flourish this long?" (Which would be unlikely if this new definition is to be believed.)
Right away, every doctor that argues the CDC on this point is now subjugated, censored and sanctioned and the pandemic narrative is perpetuated and strengthened.
TO DISCREDIT SCIENTIFIC OPPOSING OPINIONS.