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In vitro quantitation of Theileria parva sporozoites for use - TropMed ...

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64 Chapter 4: Suspension media and multiple freezing <strong>of</strong> <strong>Theileria</strong> <strong>parva</strong> stabilates<br />

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A single re-freezing cycle resulted in a significantly lower infectivity (P=0.03) than the control kept<br />

on ice <strong>for</strong> 1.5 h (Fig. 9). The ED ratio was 0.68 (95 % CI: 0.48 – 0.95) and the estimated loss in<br />

infectivity was 32 %. The loss during multiple freeze cycles was also significant (P

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