If a person is vaccinated against a disease sometime in the past, which of the following is currently in your body?

Question:If a person is vaccinated against a disease sometime in the past, which of the following is currently in your body?

1.The disease organism itself and antigens for the disease organism

2.A very high level of antibodies against the disease antigens

3.Memory B lymphocytes for the antigen of this disease organism

4.All of the above


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