Eli5: how do scientists know that someone can spread disease before showing symptoms of the disease? For example, being able to spread the flu before any symptoms start.
In: Biology
Just because you are carrying the disease does not mean it’s attacking you. Not all diseases/viruses will immediately start attacking you, some, probably most, will wait a bit. As too how scientists determine how long it takes for the virus to become active, I’ve no idea. Probably monitor samples of the virus in a lab and see how it reacts with biological material (which is also part of the process in developing a cure/vaccine/medicine to help fight the illness)
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