Which of the following types of vaccines involves the use of a weakened form of the pathogen?
Inactivated vaccine
Subunit vaccine
Live attenuated vaccine
Toxoid vaccine
The Correct Answer is C
Explanation: Live attenuated vaccines use a weakened form of the pathogen that is still capable of replicating but does not cause severe illness in healthy individuals. This type of vaccine can provide long-lasting immunity with a single dose.
Incorrect choices:
a. Inactivated vaccines use killed pathogens, not weakened forms.
b. Subunit vaccines use only specific parts of the pathogen, not weakened forms.
d. Toxoid vaccines use inactivated toxins produced by the pathogen, not weakened forms of the pathogen itself.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Explanation: B cells are specialized in producing antibodies against specific antigens. When B cells encounter a pathogen or foreign substance with a matching antigen, they become activated and differentiate into plasma cells. Plasma cells then secrete large amounts of antibodies, which can recognize and neutralize the pathogen.
Incorrect choices:
a. B cells do not directly attack and kill infected cells. That role is primarily performed by cytotoxic T cells during cell-mediated immunity.
c. Regulatory T cells (Tregs) are responsible for regulating the immune response to prevent excessive inflammation and maintain immune homeostasis.
d. B cells recognize antigens presented by antigen-presenting cells like macrophages, but their primary function is to produce antibodies, not to recognize antigens directly.
Correct Answer is B
Explanation
Explanation: Numerous scientific studies have found no link between vaccines and autism. The notion that vaccines cause autism was based on a discredited and fraudulent study, and subsequent research has shown no evidence of such a link.
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