H5N1 bird flu is still spreading across farms in the USA and this week claimed its first human life in North America - an elderly patient in Louisiana infected by backyard poultry. But last week, Sonja Olsen, Associate Director for Preparedness and Response in the CDC’s flu division, and her colleague Shikha Garg, published new analysis in the New England Journal of Medicine summarizing the human cases and epidemiology so far.

A lab study underscoring a suspected link between the virus responsible for cold sores, and Alzheimers, the most common form of dementia, has been published in Science Signalling this week. The study, by Dana Cairns of Tufts University, looks at whether repetitive brain trauma – another risk factor - adds to the evidence that latent herpes simplex can be involved.

Song Lin, a chemist at Cornell University who has won prizes for pioneering the use of electrical currents to drive chemical reactions rather than heat, has teamed up with Cornell micro engineer Paul McEuen to power up a new kind of chemistry and invent another kind of SPECS – an acronym for Small Photoelectronics for Electrochemical Synthesis. They outlined their first generation device and the promises it brings in Nature this week.

Presenter: Roland Pease Producer: Alex Mansfield Production co-ordinator: Jana Bennett-Holesworth

(Photo: Chickens eating feed. Credit: San Francisco Chronicle/Getty Images)