In an exclusive interview with CNN from his room at UniversityCollegeHospital in London, Scaramella told of the November 1 meeting he had with Litvinenko.
Stephen Spiro, professor of respiratory medicine at UniversityCollegeHospital in London, said it was difficult to know how teachers and pupils might be affected by the asbestos.
Professor Michael Adler, Head of Reproductive Health at UniversityCollegeHospital in London, said the study reinforced the importance of taking a good sexual history from people visiting STD clinics.