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Natural infection produced lasting antibodies; vaccine antibodies fell faster

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Research area:mathematics

What the study found

The study found that Rohingya refugees in Cox's Bazar had a strong and lasting IgG antibody response after natural SARS-CoV-2 infection, while vaccine-induced immunity rose and then declined more quickly. IgG is an immunoglobulin, a type of antibody measured in blood.

Why the authors say this matters

The authors conclude that the findings support timely booster doses, stronger vaccination coverage, and continued serological monitoring, which means repeated blood testing for antibodies, in high-density humanitarian settings. They also say the results can support targeted public health interventions and pandemic preparedness for displaced and vulnerable populations.

What the researchers tested

The researchers enrolled RT-PCR-confirmed SARS-CoV-2 positive cases and their household members in Cox's Bazar, Bangladesh, and followed them at multiple time points. They monitored IgG antibody responses against the receptor binding domain (RBD), a part of the spike protein that helps the virus attach to cells.

What worked and what didn't

Among 194 primary cases, 56% had detectable IgG antibodies at enrollment, and seropositivity increased to 80% at day 30, 88% at day 180, and 93% at day 360. In unvaccinated participants, RBD-specific IgG titers peaked at one month and remained detectable for up to 12 months after infection; among vaccinated primary cases, antibody titers peaked at 1 to 2 months and declined markedly within 4 to 5 months. Household members also showed an increase in seropositivity from 57% at enrollment to 71% at one month.

What to keep in mind

The abstract does not describe the study's sample size beyond the enrolled groups in the report, nor does it provide detailed limitations. The findings are specific to Rohingya refugees in Cox's Bazar and to the time points measured in this study.

Key points

  • 194 RT-PCR-confirmed primary SARS-CoV-2 cases were enrolled.
  • 47% of primary cases were symptomatic, with the highest burden among ages 18-55 years.
  • Natural infection was associated with rising seropositivity over 12 months, reaching 93% at day 360.
  • In unvaccinated participants, IgG titers remained detectable up to 12 months after infection.
  • In vaccinated primary cases, antibody titers peaked at 1 to 2 months and declined within 4 to 5 months.

Disclosure

Research title:
Natural infection produced lasting antibodies; vaccine antibodies fell faster
Authors:
Nabid Anjum Tanvir, Abu Bakar Siddik, Sharmin Aktar Mukta, Mohammad Saiful Islam, Moon Moon Monisha Dey, Shariful Islam Khan, Zahirul Islam, Abu Toha M. R. H. Bhuiyan, Md Rofiqur Rahman, Firdausi Qadri, Valentina Picot
Institutions:
Bangladesh Fisheries Research Institute, Bangladesh Fisheries Research Institute, Bangladesh Institute of Development Studies, Bangladesh Institute of Development Studies, Bangladesh Institute of Development Studies, Bangladesh Institute of Development Studies, Bangladesh Institute of Development Studies, Fondation Mérieux, Hope Foundation, International Centre for Diarrhoeal Disease Research, International Centre for Diarrhoeal Disease Research
Publication date:
2026-03-08
DOI:
10.1186/s13031-026-00774-5
OpenAlex record:
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AI provenance: This post was generated by gpt-5.4-mini (OpenAI). The original authors did not write or review this post.

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