High relative humidity (>95%) at comparatively low temperature (28°C and 33°C) did not affect the virus infectivity significantly (Figure 2(a)). High temperature (38°C) at 80–90% relative humidity led to a 0.25~2  log⁡10 loss of titre at 24 hr (Figure 2(b)). However, if the dried virus was stored at high temperature (38°C) and high relative humidity (>95%), there was a further ~1.5 log⁡ loss of titre for each time point up to 24 hr (0.38~3.38 log⁡10) when compared with high temperature (38°C) at a lower relative humidity 80–90% (Figures 3(a)–3(c)).