Why can a child, who has previously been immunized against whooping cough, develop signs of the disease?
Possibly, that when the child was immunized, his/her body was not ready to produce antibodies yet.
It is crucial to keep in mind that newborns' immune systems are still developing, and this includes our B lymphocytes.
It is plausible that the child's immature immune system prevented the vaccination from eliciting an immune response.
The child might also be suffering from an acquired immunodeficiency.
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Immunity from vaccines may wane over time, making individuals susceptible to infections. Additionally, vaccines are not 100% effective. In some cases, individuals may still contract the disease despite being immunized.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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