Study of healthcare workers shows COVID19 immunity lasts for many months

Meanwhile this study about human coronaviruses tells the exact opposite story: https://www.nature.com/articles/s41591-020-1083-1

A group of Dutch clinicians have been taking blood samples from a cohort of people for 30 years now (it started out as a project to study AIDS/HIV) and measured antibody levels against the other human coronaviruses. They find that people get re-infected after a year or so. There's no reason to believe that the immune system should behave any different towards COVID-19.

Given the US government's past track record on the pandemic, right now I'm disinclined to trust the CDC.