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Thermal inactivation assays of selected 949, P087, and 936 isolates at room temperature (control, black bars), 63 °C (grey) and 83 °C (patterned). The 949 isolates display almost complete inactivation at 83 °C and reduced titres at 63 °C. The P087 isolates exhibit approximately 5 log titre at 83 °C and only minor titre reductions (one to two logs) at 63 °C.
