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How long do Covid antibodies from the vaccine last? 

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Both HAV immunisation regimens (0,6 mo and 0,12 mo) induced persistence of vaccine-induced antibodies against HAV for at least 17 y after primary vaccination.
This study confirms the long‐term immunogenicity of the three‐dose regimen of the combined hepatitis A and B vaccine, as eliciting long‐term persistence of antibodies and immune memory against hepatitis A and B for up to at least 15 years after a primary vaccination.
The long-term immunogenicity and effectiveness of live attenuated hepatitis A vaccine (H2 strain) after one dose injection could last as long as 15 years.
These findings confirm the long-term persistence of vaccine-induced type-specific pneumococcal antibodies and suggest that the interval between repeated doses of pneumococcal vaccine should be at least 5 years.
In summary, although patients with COVID-19 generated neutralizing antibodies, they may still shed infectious SARS-CoV-2 for over 3 months.
These results indicate that initially high levels of TBE antibodies following the first booster dose of the vaccine may lead to long-term persistence of TBE antibodies, confirming previous findings and suggesting it may be appropriate to extend the interval between booster doses from 3 to 5 years.
This study confirms that serum and saliva IgG antibodies to SARS-CoV-2 are maintained in the majority of COVID-19 patients for at least 3 months PSO.

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