“ the previous public health systems , ” the agency said . “ with the spike in flu cases around the country , this grand rounds will provide key and timely information for public health professionals on how to reduce the spread of seasonal flu in communities and adjust to spot shortages in antiviral drugs because of high influenza activity in some areas , ” the cdc said . an atomic bomb explosion ( u.s. air force ap ) the centers for disease control and prevention has rescheduled a teaching session on the public health response to a nuclear blast that was to take place tuesday . ” about three dozen media outlets had expressed interest in attending the session , which is broadcast from cdc announcement featured a photograph of the distinctive mushroom cloud from a nuclear blast . but media interest in the topic was unusually strong , given the escalating tensions between president trump and north korean leader kim jong un and their most recent war of words over which leader has the larger nuclear arsenal and bigger “ nuclear button . on friday afternoon , the agency said it was changing the topic to influenza and took down the mushroom cloud photo and the announcement about public health responses to a nuclear blast . much attention had been drawn to the timing of the agency ’s session , which was publicized just days after president trump touted the size of his nuclear button compared with north korea ’s . ” it was planned months ago as part of a regular series of monthly webinars the cdc called public health grand rounds , officials said .