The Telegraph has a story about how "an American team has used a pioneering genetic method to help convict an American doctor of deliberately infecting his former girlfriend with Aids." The story grabs one's attention by suggesting people could be open to legal claims for passing common colds to others but later suggests this may be completely impractical in practice; these kinds of air-transmitted virii would be difficult to trace. Nevertheless, this does open up the possibility. If nothing else it could lead to people staying at home when ill, rather than heroically staggering to work. Or there could be insurance against such lawsuits, cold-prone people confined to relative isolation, masks and gloves worn to prevent germs travelling... (via Metafilter)