Recently, Spencer et al. published their interesting article in Influenza and Other Respiratory Viruses providing evidence that there is no impact of diabetes status on immunogenicity of trivalent inactivated influenza vaccine in older adults. Although we agree with the conclusion, we suggest that the transportation condition of the serum samples should be added in the description of serological surveys of influenza in the future. Stability of specific influenza antibodies in sera samples stored in differing conditions should be considered.

In June 2021, Udom et al. published their article in  Transboundary and Emerging Diseases performing a serological survey revealed evidence of anti-N-IgG antibodies suggesting SARS-CoV-2 exposure in both dogs and cats during the first and second coronavirus disease 2019 (COVID-19) outbreaks in Thailand. Seroprevalence studies have proven an important tool to monitor the progression of the COVID-19 pandemic. The duration of immunity of SARS-CoV-2 is crucial for the course of the pandemic and for this reason the monitoring of antibodies against SARS-CoV-2 is important. The serum samples from different periods and regions were valuable in terms of scientific significance for serological survey of SARS-CoV-2 and emerging infectious diseases. In order to preserve the remaining serum samples and ensure the stability of anti-virus antibodies in storage serum samples, we strongly suggest that standard serum banks should be established worldwide.