Plant virus disease problems in the developing world

Viruses are among the smallest and simplest pathogens. In fact, they are so small that they cannot be seen with the naked eye or even a conventional light microscope—only an electron microscope is powerful enough.

Viruses are unique from bacteria and fungi because they are not classified as living organisms. This is because they are dependent on having a living host in order to replicate. The first known virus was the tobacco mosaic virus, which was discovered in Since then, more than 5, have been described. It is important to understand that not all viruses cause disease—some can replicated within a host without causing harm to the host.

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