An individual receives multiple booster vaccinations against an evolving influenza strain. Which outcome directly reflects affinity maturation in memory B cells?

💡 Explanation

Repeated exposure to slightly different antigens drives affinity maturation because B cells producing antibodies with higher affinity for the antigen are preferentially selected to differentiate into plasma cells. Therefore, a higher affinity results, rather than lower affinity due to alternative processes.

• Why does excessive skin cleansing with harsh detergents frequently lead to increased acne outbreaks, even though the initial goal is to reduce sebum?
• If a patient presents with fatigue and elevated blood pyruvate despite normal oxygen levels, which vitamin deficiency should be suspected, given its role in the pyruvate dehydrogenase complex?
• Why does lithium have a larger volume of distribution than expected based on its molecular weight during treatment of bipolar disorder?
• Why does endurance performance decrease during dehydration, even when plasma osmolality hasn't yet triggered the full thirst mechanism?
• Why does consuming antibiotics increase the risk of Clostridium difficile infection in the colon, post digestive process?
• A woman with a history of recurrent miscarriages is prescribed progesterone suppositories during early pregnancy. Which process is being augmented to reduce miscarriage risk?