What to Do in the Next Pandemic Outbreak: Natural Herd Immunity Versus Lockdown (Lessons Learned from COVID-19).

The purpose of this article is to analyse non-pharmaceutical approaches to control pandemics. Currently vaccines are our best hope to control the COVID-19 pandemic, but before the appearance of the first vaccines the available possibilities were much more limited. While most people worldwide were confined to their homes to slow the spread of the new coronavirus, some countries (most notably the United Kingdom) advocated infecting the majority of the community, aiming to achieve what has been called "herd immunity". This article focuses on two non-therapeutic strategies for dealing with deadly viruses and points out their respective problems: natural herd immunity and quarantines/lockdowns. It analyses these strategies from three perspectives: legal, ethical and social. The article concludes that in the absence of therapeutic alternatives (vaccines), short-term lockdowns are necessary, but long-term lockdowns are legally, ethically, socially and financially impossible to sustain.