What are the efficacy concerns with repeated vaccine doses?

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Repeated Vaccine Doses May Lead to Diminishing Efficacy and Increased Side Effects

Concerns exist regarding the efficacy of repeated vaccine doses, with early indications suggesting a potential for diminished effectiveness over time. Furthermore, repeated administration of the same vaccine may also result in a more pronounced experience of side effects.
Potential for Reduced Effectiveness

Data suggests that as individuals receive repeated doses of a vaccine, its ability to provide protection may gradually decrease. While specific metrics on this decline are still under study, the trend indicates a potential need for ongoing evaluation of vaccine performance with subsequent administrations.
Increased Side Effect Severity

The practice of receiving multiple doses of the same vaccine has also been associated with a tendency for side effects to become more severe with each subsequent dose. This observation suggests a heightened immune response or other physiological reactions that manifest more strongly upon repeated exposure to the vaccine.
Ongoing Study of Vaccine Strategies

These concerns are being considered within the broader context of vaccination strategies, including the exploration of heterologous vaccination, which involves mixing different types of vaccines. While some early data from trials, such as a German study involving 26 patients, indicated that mixing AstraZeneca and Pfizer-BioNTech vaccines might generate stronger immune responses and increased antibody neutralisation against variants like Alpha and Beta, a conclusive decision on such strategies has not yet been made in Malaysia. The expert technical group continues to study these possibilities.

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What are the efficacy concerns with repeated vaccine doses?

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