00:00 10 August 2009 The microscopic agents that infect humans
are a diverse group of nasties. Find out about ten of the most
important in our psychedelically coloured guide Image 1 of 11
Transmission electron micrograph (TEM) of human herpes virus-6
(HHV-6) , previously known as HBLV (human b-lymphotropic virus).
It causes exanthem subitum , or Roseola, a disease that affects
nearly every human baby. Babies with the disease generally have
a fever for about 3 days, which is then followed by a rash.
(Image: CDC / Science Photo Library)