Learn with Harvard Medical School faculty about how the body fights disease.

We live in a microbial world, which means that we constantly encounter microorganisms that could harm our health. The human immune system continuously defends us against these threats to our survival. Understanding how immunity works is important for making sense of the news around the risk, spread, and treatment of diseases like COVID-19 (also known as coronavirus disease).

In this curated selection of videos and interactive materials from HMX Immunology courses, you’ll learn about the processes that enable our immune system to respond to microbial threats.

Please note: HMX online courses in immunology are primarily designed for those working in areas related to health care and the immune system, including diagnostics and treatments. Given the current situation, we’ve decided to make relevant material available to all. We understand that not everyone may have the appropriate background, and we encourage you to use other resources as needed to understand any unfamiliar terms and get the most from this material.