Not confirmed but rumour is the guys who caught malaria had not been taking their p and c tabs. Advice from the meds is that p and c actually works in Karachi. However have to say I have travelled to some dodgy parts of Africa and been given Doxy as a more effective tab. Word is that doxy is more expensive. I am more concerned about the prolonged use of tabs On the AT fleet just now there is a constant need to be taking the tabs. I have decided not to bother. I am following a massive do not get bitten routine. U nfortunately I have also been told that tonic no longer contains quinine...... Thanks for the replies especially about the Civil Aviation stuff.