Team significantly expands the global diversity of large and giant viruses
(PHYSorg.com Biology)

While the microbes in a single drop of water could outnumber a small city`s population, the number of viruses in the same drop-the vast majority not harmful to humans-could be even larger. Viruses infect bacteria, archaea and eukaryotes, and they range in particle and genome size from small, to large and even giant. The genomes of giant viruses are on the order of 100 times the size of what has typically been associated with viruses, while the genomes of large viruses may be only 10 times larger. And yet, while they are found everywhere, comparatively little is known about viruses, much less those considered large and giant.