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Review: What type of microscopy is this? - page 27 / 42

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Quantifying Human Virus Infectivity is a Challenge

Some infect only humans

Some infect certain experimental animals, too

Some infect experimental animals and cell cultures

Different ratios of infectivity to virions (particles)

1 infectious unit ~ 1 virus particles

some bacteriophages)

1 infectious unit ~100 virions:

some cell culture adapted viruses

1 infectious unit ~10,000-100,000 virions

many “wild-type or field viruses

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