With the Health Ministry urging the public to avoid travelling to flu-affected countries,it faced a piquant situation recently with its own Secretary and Joint Secretary required to go to the US. To make sure all was well with the two officers,frequent calls went out from senior officials to them,enquiring about their well-being. Soon,a suggestion emerged that both the officials should be requested to avoid coming to Nirman Bhawan for some days after they returned to the country since the incubation period of the virus is between two-three days.