AI Article Synopsis
- Serological testing in Singapore revealed that individuals who received smallpox vaccinations in childhood still have long-term humoral immunity, demonstrated by anti-vaccinia IgG levels and neutralizing activity.
- There is a significant correlation between the levels of IgG and neutralizing titers, suggesting that IgG can serve as a surrogate marker for measuring immunity.
- Following an imported monkeypox case in 2019, it was found that older Singaporeans vaccinated before 1981 retained higher levels of anti-vaccinia IgG, indicating potential protective immunity against orthopoxvirus outbreaks.
Article Abstract
Serological testing of Singaporeans who received childhood smallpox vaccination found anti-vaccinia IgG binding and neutralizing activity indicating long-term humoral immunity. There was correlation between IgG and neutralizing titers indicating IgG could be used as a surrogate marker for humoral immunity. In 2019, Singapore experienced a case of imported monkeypox. As with smallpox, disease can be prevented through vaccination, which was mandatory for Singaporean infants until 1981. However, the degree of residual immunity in older vaccinated Singaporeans remains unknown. Sera from individuals born 1946-1984 were therefore tested and those born prior to 1981 were found to have higher anti-vaccinia IgG and neutralizing activity titers. This suggests that protective humoral immunity remains, which could reduce disease severity in an orthopoxvirus outbreak. Correlation between IgG and neutralizing titers was observed indicating that serology could be used as a surrogate marker for immunity.
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| http://dx.doi.org/10.1093/infdis/jiac409 | DOI Listing |
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