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[Newsphopick=Gyubin Lee] When Shaila Rivera and her new husband returned home from their honeymoon and tested positive for Covid-19, they expected a phone call from their local health authorities in Florida asking for a list of people they'd been near so that contact tracing could begin.

Despite claims that Florida traces every case of Covid-19, an investigation found that health authorities in Florida, now the nation's No. 1 hotspot for the virus, often fail to do contact tracing, long considered a key tool in containing an outbreak. 

Florida set a record for most coronavirus cases in the US in a single day on Saturday, with a total of 11,458, according to data compiled by Johns Hopkins University, and on Sunday, the state surpassed 200,000 Covid-19 cases. 

Florida's contact tracing challenges are indicative of how hard it is for states hard hit by Covid-19 to do proper contact tracing, which is a challenge even under the best of circumstances. 

The virus is so far along in states like Florida that it's a seemingly Herculean task to track down every infected person and follow up with all their close contacts.