Fears were growing today for the health of an elderly Irish missionary who was dramatically kidnapped in the Philippines by armed raiders who burst into his home.

In a report prepared by NCB Stockbrokers, senior analyst Dr Orla Hartford has reviewed the data available in Elan drug Tysabri's Biological License Application (BLA) in an attempt to understand why PML developed in two multiple sclerosis patients on Tysabri and AVONEX combination treatment.