If we picked a flu vaccine that is effective as the current mRNA vaccines appear to be against Delta, we would be celebrating. They're only slightly less good against Delta than the originally circulating strain, the concern is places in The US that have not seen a lot of Covid and vaccination rates among the high-risk population is low.

Justin Lessler

It could be a long time before the health care systems in the region recover from this, while the downstream effects of Ebola are many, we can actually do something about measles relatively cheaply and easily, saving many lives by restarting derailed vaccination campaigns.

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The secondary effects of Ebola -- both in childhood infections and other health outcomes -- are potentially as devastating in terms of loss of life as the disease itself.

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If there is a right combination of vaccine hesitancy, potentially new variants and quickly rolling back control measures that comes together, we could potentially screw this up and have yet another wave that is completely unnecessary at this point.

The virus just takes time to replicate in the body to detectable levels, justin Lessler can get infected by just a few viral particles, but these will not be detectable until they have time to replicate to adequate levels to be detected.

There is no hard and fast rule, but the evidence suggests getting a test before the third day after exposure is not of much use.