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               SUMMARY (cont.)

- Certain viruses become latent and integrated in-vivo and reactivate later or cause tumours.

- Virus replication results in cell death with pyknosis or rounding, syncytium formation then a slower death, no effect, or transformation.

- Virus infectivity can be measured by TCID50 or pfu.

- Samples must be kept cold and sterile before assey.

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