This is a comprehensive summary of Biohacker’s Flu Guide (2020) which focuses on improving immunity and strategies for building various barricades against intruders before they get the opportunity to take hold. The aim is to inhibit their proper functioning and make one more resistant to their effects. INTRODUCTION The world has turned into a giant petri dish for brewing potential pathogens that can wreak havoc on our health, productivity and wellbeing. Luckily, modern times bring modern responses to epidemics: outbreaks are identified much more quickly, disease agents are identified at record speed, epidemics get contained quickly and treatments are developed faster. We take no opinion on vaccination, as it is a controversial topic, although our recommendation is to do your own research, look into historical data, read scientific peer-reviewed journals and talk to specialists regarding actual risks and trade-offs. BASICS OF THE IMMUNE SYSTEM The immune system is divided into two major parts: Innate immunity: is what a person is born with. It is also affected by the vaccinations received and microbes the peson is exposed to during their lifetime. Adaptive immunity: is what a human being learns over a lifetime by exposing oneself to various pathogens. Reaction to a …