Demands for zero levels of risk are frequently made by environmental groups.

A confidential enquiry into each case of MTCT is advocated to reduce vertical transmission rates to zero levels.

Guidelines for the safe operation of commercial spas state that there should be zero levels of pseudomonas in the systems.'

With the Federal Reserve having kept interest rates at near zero levels for six years, the profit from those investments has dwindled.

To assure markets that overnight rates will stay at near- zero levels, the committee promised instead to seek maximum employment and 2 percent inflation.

For rich economies, a rapid rise in bond yields from near- zero levels could hurt bank lending and lead to market instability, the BoE said.

Most of the rest of Europe is forecast to warm up in coming days, although a drop back to sub- zero levels is likely next week.