A pharmaceutical company is offering a free trip to Mexico to anyone willing to test their new diarrhea drug. Almost 1000 volunteers will be able to have some fun in the sun on Intercell's dime as long as they wear a patch that delivers the new drug, and they agree to regular testing should they fall ill. Nigel Thomas, clinical director of Intercell, said: "We are looking for people who have already planned to go to Mexico or Guatemala and think this would add another interesting aspect. We cover their expenses – flights and accommodation – nothing beyond that. It is almost like going on a package holiday. They will be met by a concierge who will take them to their hotel and arrange for them to give their first blood sample within 48 hours."