— HIV plays a cruel game of hide and seek. Researchers, however, claim to have found one of its hiding places: progenitor blood cells. A new study suggests that the retrovirus lies dormant inside bone marrow, allowing infection to persist even after treatment.

— The fight against polio is going door-to-door in central and western Africa. A new campaign by the United Nations and Red Cross is looking to vaccinate 85 million children under age five. About 400,000 volunteers will visit homes in 19 countries to provide the oral vaccine. (BBC)

— According to new research, T cells require vitamin D to fully activate an immune response, with the cells expressing vitamin receptors once they encounter a foreign antigen. The findings could contribute to vaccines and medications for better regulating the immune response.

— Swiss voters overwhelmingly rejected yesterday an initiative that would have appointed a taxpayer-supported animal rights lawyer in each of the country’s cantons. Many pointed to the already animal-friendly Swiss laws protecting the dignity of animals, and even plants; those protections could also hinder research. (Telegraph)

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