In the first study to confirm a case of Covid-19 reinfection in the US, researchers found evidence that an individual with no known immune disorders or underlying conditions was infected with Covid-19 in two separate occasions. However there have been some reported cases of reinfection worldwide, most recently a 25-year-old resident of Washoe County in Nevada in the United States.
According to data analyzed by Johns Hopkins University, there have been at least 215,000 deaths from COVID-19 in the U.S., resulting from more than 7.8 million infections.
The patient tested negative for the virus after testing positive for SARS-CoV-2 in April 2020, the researchers said.
We're still learning about COVID-19, but when it comes to how long the illness lasts, patients generally feel sick around the same amount of time.
The patient has since been discharged from the hospital and has recovered from the second infection, the study noted.
"All individuals, whether previously diagnosed with COVID-19 or not, should take identical precautions to avoid infection", researchers wrote in their journal article.
There were 8,505 new COVID-19 infections over the past 24 hours in France, data showed, sharply down from Saturday's record of 26,896 and Sunday's 16,101.
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The Netherlands National Institute for Public Health confirmed the matter.
Many conspiracy theories claim that the true number of COVID-19 deaths is much lower officially reported, essentially suggesting that the threat of the pandemic has been blown out of proportion for various nefarious purposes.
'So far, we've only seen a handful of reinfection cases, but that doesn't mean there aren't more, especially as many cases of COVID-19 are asymptomatic.
"It is becoming increasingly clear that reinfections are possible, but we can't yet know how common this will be", said Simon Clarke, a microbiology expert at Britain's Reading University.
According to the researchers, the patient may also have come in contact with a more virulent variant of the virus. It is unclear whether the virus itself or the inflammation it can cause leads to these lingering problems, said Dr Jay Varkey, an Emory University infectious diseases specialist.
"These findings reinforce the point that we still do not know enough about the immune response to this infection", said Paul Hunter, a professor in medicine at Britain's University of East Anglia.
In the report of the Dutch woman's case, researchers said COVID-19 reinfections are expected to occur once antibodies decrease and immunity wanes.