There are two viruses that can cause immune system suppression. (chai-online.org)
A subset of immune cells that manage immune system suppression, known as regulatory T cells, begins learning to tolerate the fetal cells as non-foreign. (scientificamerican.com)
New Zealand's peak UV - B levels could put the country's inhabitants at increased risk of skin cancer, cataracts, and perhaps immune system suppression. (sciencemag.org)