Today, when a deadly virus explodes out of nowhere, geneticists are indispensable players in the international game of whodunit. Here's how they help.
The genetic code of the coronavirus that causes COVID-19 is only about 30,000 characters long, but what a story it tells.
With luck, the result is a time-stamped map of the germ’s spread that includes every case of illness, death and recovery. These investigations provide inferences and insights about how a pathogen spreads, how deadly it is, and what measures — including quarantines, school closures and travel restrictions — could slow its transmission.Yet contact tracing is an imperfect process that relies on peoples’ memories, their candor, and an absence of chance encounters with strangers.
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