What question did this study set out to answer?

The aim is to create a method for detecting asymptomatic infections and assessing the duration of vaccine-induced protection.

Transiently produced IgGs enable infection-blocking vaccine efficacy assessment

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Randomized trial evaluates infection-blocking potential of vaccines in pigs, suggesting a new detection method for asymptomatic infections.

The aim is to create a method for detecting asymptomatic infections and assessing the duration of vaccine-induced protection.
Developed a serology-based strategy using porcine circovirus 2 vaccines.
Analyzed anti-peptide IgG responses and created a digital microarray index (DMI) for evaluation.
Assessed immune status using single-day samples from eight farms.
Anti-peptide IgGs are transiently produced after vaccination and re-induced upon infection.
DMI successfully ranked five commercial vaccines based on infection-blocking efficacy.
DMI paired with vaccination timing accurately determined herd-level immune status.

Li et al. (2026) studied this question.

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Randomized trial evaluates infection-blocking potential of vaccines in pigs, suggesting a new detection method for asymptomatic infections.