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A tale of two colleges
COVID-19 at the University of Wisconsin this fall has been pretty much a non-issue. While we are wearing masks, full in-person teaching is happening on campus. Bars, restaurants, and all other busine…
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Get your Vitamin D to Protect Yourself from COVID-19
This sounds like another hydroxychloroquine or ivermectin hoax, but the science is peer-reviewed. Getting enough vitamin D in your diet is an excellent way to protect yourself from severe COVID-19. E…
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About 35,000 people die from drug-resistant infection in the US. What are we going to do?
When antibiotics first achieved widescale use in the middle of the 20th century, they had a tremendous impact. For example, the mortality rate in England from infectious disease dropped from 25% in 1…
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15-1 Introduction

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From a microbe's point of view, our bodies are excellent places to live and as a result we are covered with microorganisms. Most of these associations are benign or even beneficial, but a few are damaging to the animal host and they would rapidly spread throughout our tissues if it were not for the immune system. This intricate and complex collection of proteins, cells and tissues has the daunting task of keeping the tens of billions of little travelers attached to our bodies from entering areas where they ought not to be. It is nearly unbelievable that the immune system is up to the task, yet it certainly is and our lives depend on it. This chapter will describe the array of defenses that mammals have to protect themselves from infectious disease.