A mixed infection of adeno- and parvoviruses. The adenoviruses multiply predominantly in the pharynx, the conjunctival skin and the small intestine. Parvoviruses are the triggers of ringlets. Parvoviruses occur in humans and animals, the only f. d. The virus B19 is important to humans. The diameter of the adenoviruses is 80 μm, the parvoviruses 20-24 nm.
Transmission electron microscope, 90,000: 1 (at 12x12cm image size)