Quotes from Peter Parham

When vaccination programs are successful to the point where the disease is unfamiliar to physicians and public alike, then concerns can arise with real or perceived side effects of a vaccine that affect a very small minority of those vaccinated. Such concerns lead to fewer children being vaccinated and to increasing occurrence of the disease.

In the absence of infection, more than 100 million NK cells are circulating at speed throughout the human body, fully loaded with poisons whose sole function is to kill human cells. This dangerous state of affairs necessitates strict regulation of the activation and implementation of NK-cell cytotoxicity.

The total number of different specific antibodies that can be made by an individual is known as the antibody repertoire and it might be as high as 10^16. In practice, the number of B cells limits the actual repertoire to closer to 10^9.