Viruses

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1. Disease causing submicroscopic organisms.

polio1.gif

This is a magnified image of a single virus cell.
Source: http://www.path.ox.ac.uk/dg/vdisease.html

hivlifecycle.jpg

This image shows magnified virus cells invading other cells.
Source: http://pr.caltech.edu/periodicals/EandS/articles/LXVII1/viruses.html