An mRNA vaccine elicits a stronger antibody response after a booster shot; which mechanism explains this phenomenon involving B cells?

💡 Explanation

Affinity maturation explains the improved antibody response following a booster, because repeated antigen exposure drives somatic hypermutation in B cells, selecting for higher-affinity antibodies. Therefore, the antibodies become more effective at neutralizing the virus, rather than the exhaustion of T cells suppressing proliferation.

• If a patient's asthma is triggered by pollen exposure, causing airway inflammation and bronchospasm, which mechanism explains the immediate increase in airway resistance?
• A patient experiences chronically elevated blood pressure causing increased afterload. Which compensatory mechanism is most likely to initially limit cardiac output decline?
• If a 55-year-old person struggles to read fine print despite corrective lenses for distance, which process explains why the ciliary muscle's behavior leads to this specific vision change?
• A researcher investigates insulin resistance in adipocytes by inhibiting IRS-1 phosphorylation. Which consequence follows regarding GLUT4 translocation when insulin binds its receptor?
• Why does vaccine effectiveness against a rapidly mutating virus, such as influenza, wane over time despite initial high antibody titers?
• Why does accommodation reflex failure, linked to presbyopia, increasingly impair an aging accountant's ability to discern numbers on a close-range ledger, versus distant monitors?