<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mi mathvariant="normal">Viability</mml:mi>
<mml:mfenced close=")" open="("> <mml:mo mathvariant="normal">%</mml:mo>
</mml:mfenced>
<mml:mo>=</mml:mo>
<mml:mfrac> <mml:mrow> <mml:mi mathvariant="normal">Number</mml:mi>
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<mml:mi mathvariant="normal">of</mml:mi>
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<mml:mi mathvariant="normal">live</mml:mi>
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<mml:mi mathvariant="normal">cell</mml:mi>
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<mml:mi mathvariant="normal">in</mml:mi>
<mml:mspace width="0.25em"/>
<mml:mi mathvariant="normal">infected</mml:mi>
<mml:mspace width="0.25em"/>
<mml:mi mathvariant="normal">sample</mml:mi>
</mml:mrow>
<mml:mfrac> <mml:mrow> <mml:mi mathvariant="normal">Number</mml:mi>
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<mml:mi mathvariant="normal">of</mml:mi>
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<mml:mi mathvariant="normal">live</mml:mi>
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<mml:mi mathvariant="normal">and</mml:mi>
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<mml:mi mathvariant="normal">dead</mml:mi>
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<mml:mi mathvariant="normal">in</mml:mi>
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<mml:mfrac> <mml:mrow> <mml:mi mathvariant="normal">Number</mml:mi>
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<mml:mi mathvariant="normal">of</mml:mi>
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<mml:mi mathvariant="normal">live</mml:mi>
<mml:mspace width="0.25em"/>
<mml:mi mathvariant="normal">cells</mml:mi>
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<mml:mi mathvariant="normal">in</mml:mi>
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<mml:mrow> <mml:mi mathvariant="normal">Number</mml:mi>
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<mml:mi mathvariant="normal">of</mml:mi>
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<mml:mi mathvariant="normal">live</mml:mi>
<mml:mspace width="0.25em"/>
<mml:mi mathvariant="normal">and</mml:mi>
<mml:mspace width="0.25em"/>
<mml:mi mathvariant="normal">dead</mml:mi>
<mml:mspace width="0.25em"/>
<mml:mi mathvariant="normal">cells</mml:mi>
<mml:mspace width="0.25em"/>
<mml:mi mathvariant="normal">in</mml:mi>
<mml:mspace width="0.25em"/>
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</mml:mfrac>
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</mml:mfrac>
<mml:mo>&#215;</mml:mo>
<mml:mn>100</mml:mn>
<mml:mo mathvariant="normal">%</mml:mo>
</mml:math>