Can exposure to a single virus particle lead to infection or disease? Until now, solid proof has been lacking. Experimental research with insect larvae at Wageningen University and Simon Fraser University in Canada has shown that one virus particle is theoretically enough to cause infection and subsequent disease.
The researchers are publishing this finding in this week's edition of the Proceedings of the Royal Society B.
A virus population is usually composed of a collection of variants of virus particles. In order to investigate whether virus particles (virions) can cause an infection independently from each other, and therefore individually, the researchers set up an experiment with two 'marked' virus variants. They exposed a population of hosts (caterpillars) to both variants.
The experiment showed that exposure to a low dosage of virus particles resulted in a small number host infections (20%). The majority of these hosts (86%) turned out to be infected by a single virus genotype. In contrast, exposure to a high dosage of virus particles resulted in virtually all the hosts (99%) becoming infected, where most of the hosts were infected by both types of virus. Only 14% were infected by only one of the two variants.