Virus antibodies after SARS‐CoV‐2 infection.

In addition, different types of antibody tests give different detection rates and different seropositivity and this means that disagreements among tests are possible.3,4 In the present study, Breuer et al.1 utilised a dual-assay model to minimise the variance in sensitivity. We would like to share our thoughts on the paper published recently in I Acta Paediatrica i that stated that severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibodies started to decline just four months after children became infected with the virus.1 Breuer et al.1 also concluded that reopening schools did not affect infection rates. Indeed, long-term antibody levels after vaccination are an important issue, and recent studies have found different levels of antibodies in previously uninfected adult individuals.2 Nevertheless, Breuer et al. did not explore antibody levels in vaccinated children, as at the time of their study only adults were being vaccinated. [Extracted from the article]