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Disease is an unavoidable fact of life.
For a microorganism you are an ecosystem waiting to be conquered.
The total surface area of your skin is about two square yards (meters) (about half the size of a pool table)
but on average there are about 200 square yards (meters) of mucous membranes in a healthy adult (about the same as a tennis court),
Your immune system army has already killed billions of enemies and parasites in your life, and it is ready to kill billions or trillions more.
every second at least one million of your body cells go through some form of controlled suicide.
Every single second, you shed around 40,000 dead skin cells.
A healthy individual’s skin holds up to forty different bacteria species, as different areas of your skin are drastically different environments with their own specific climates and temperatures.
The complement system is one of the oldest parts of your immune system,
Basically the complement system is an army of over thirty different proteins (not cells!)
about FIFTEEN QUINTILLION complement proteins are saturating every fluid of your body right now.
Helper T Cells are able to recognize an antigen only if it is presented in an MHC class II molecule.
Antibodies and starts to vomit them out, so they can attack your enemies—up to 2,000 per second.
And B Cells do not need an MHC molecule, they don’t need to get a presentation from another cell like T
So complement proteins attached to an antigen makes it about 100 times easier to activate a B Cell than it would be to activate it without the complement.
IgA is the most abundant antibody in your body and its main job is to serve as a cleanup mechanism for your mucosa.
Dendritic Cells sample commensals, they order the local immune system to chill out and not be too annoyed by their antigens.
According to some estimates, a single cell infected by influenza A, is, on average, able to produce enough viruses to successfully infect twenty-two new cells before the first
