Which of the following vaccines is recommended for infants at 2 months of age to protect against whooping cough (pertussis)?
MMR (measles, mumps, rubella) vaccine
Hepatitis B vaccine
DTaP (diphtheria, tetanus, acellular pertussis) vaccine
Varicella (chickenpox) vaccine
The Correct Answer is C
Explanation: At 2 months of age, infants are recommended to receive the DTaP vaccine, which protects against diphtheria, tetanus, and pertussis (whooping cough). The MMR vaccine protects against measles, mumps, and rubella and is usually administered at a later age. The hepatitis B vaccine is given shortly after birth, and the varicella vaccine is typically administered at 12 months of age.
Incorrect choices:
a. The MMR vaccine protects against measles, mumps, and rubella, not whooping cough (pertussis).
b. The hepatitis B vaccine is typically given shortly after birth, not at 2 months of age.
d. The varicella vaccine is usually administered at 12 months of age, not at 2 months.
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Related Questions
Correct Answer is C
Explanation
Explanation: Receiving antibodies through placenta during pregnancy. Passive immunity is acquired when preformed antibodies are transferred from one individual to another, providing immediate but temporary protection. This can occur naturally through breastfeeding or artificially through administration of preformed antibodies, as in the case of placental transfer of antibodies from a mother to her baby.
Incorrect choices:
a. Receiving a flu vaccine involves active immunity, where the body is exposed to an attenuated or inactivated pathogen to stimulate the production of antibodies and memory cells for long-term protection.
b. Developing immunity after recovering from a viral infection is an example of active immunity, where the body mounts an immune response and produces memory cells to provide long-lasting protection against the pathogen.
d. Producing memory cells after exposure to a pathogen is part of the adaptive immune response and contributes to long-term immunity, not passive immunity.
Correct Answer is B
Explanation
Correct answer: B
Explanation: T cells, specifically cytotoxic T cells (CD8+ T cells), are responsible for cell-mediated immunity. They directly recognize and attack infected or abnormal cells, leading to their destruction. This process is crucial in controlling viral infections and cancer cells.
Incorrect choices:
a. B cells, not T cells, are responsible for the production of antibodies during the humoral immune response.
c. Phagocytosis of pathogens is mainly carried out by macrophages and neutrophils, not T cells.
d. Allergic reactions are primarily mediated by a different type of T cells called helper T cells (CD4+ T cells), not cytotoxic T cells.
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