It did not seem like a good thing when a precious consignment of human tumour samples on its way from Kampala, Uganda, to Heathrow was diverted to Manchester. When the samples finally arrived at the Middlesex hospital in London, they were swimming in murky fluid in their vials as though they had been infected with bacteria.
But when the pathologist Anthony Epstein looked at the fluid under the microscope he saw no bacteria, just individual cells that had been shaken loose from the tumours. And that was just what he needed in order to search for elusive virus particles and test his hunch that they were causing cancer.
