By Dr. Angela N. Baldwin ABC news

Chloroquine, an old malaria drug, may help treat novel coronavirus, doctors say Chloroquine, or hydroxychloroquine, has been used to treat malaria since 1944.

What do malaria and COVID-19 have in common? On the surface, not much. But according to early research, an old malaria drug called chloroquine might also work for the new coronavirus.

Could a decades-old malaria drug work to treat COVID-19? Elon Musk seems to think so, recently tweeting that it “might be worth considering chloroquine” for COVID-19. Although data are spare, studies so far seem to back up the billionaire entrepreneur’s suggestion.

Chloroquine, or hydroxychloroquine, has been used to treat malaria since 1944. It can be given before exposure to malaria to prevent infection, and it can also be given as treatment afterward.

Malaria is a disease that is caused by a parasite, unlike COVID-19. Nevertheless, laboratory studies show chloroquine is effective at preventing as well as treating the virus that causes severe acute respiratory syndrome, or SARS, a close cousin of COVID-19.

Given chloroquine’s effectiveness in treating SARS, scientists have investigated if it will be an effective treatment against the new coronavirus responsible for COVID-19. So far, the initial trials are encouraging.

“There is evidence that chloroquine is effective when they looked at SARS in vitro with primate cells,” said Dr. Len Horovitz, a pulmonologist and internist at Lenox Hill Hospital in New York City. “The theory of the experiment with primate cells was that chloroquine could be for preventing viral infection or as a treatment for viral infection after it had occurred. In vitro in these primate cells, there was evidence that viral particles were significantly reduced when chloroquine was used.”

Both the virus that causes SARS and the virus responsible for COVID-19 belong to the same overarching family of coronaviruses. Researchers in China discovered that the protein spikes on the surface of the COVID-19 virus are similar to the protein spikes found on the surface of the SARS virus.

People become infected when those protein spikes bind to special receptors on the outside of human cells. Chloroquine works by interfering with those recepters, which may interfere with the virus’s ability to bind to cells.

“The way that it worked against SARS was by preventing of the attachment of the virus to the cells. Chloroquine interfered with the attachment to that receptor on the cell membrane surface,” Horovitz said. “So it’s disrupting a lock and key kind of mechanism of attachment.”

Researchers in China found that treating patients with COVID-19-associated pneumonia with chloroquine may shorten their hospital stay and improve the patient’s outcome.

There are more than 20 ongoing clinical trials  in China and  more scheduled to start in England, Thailand, South Korea and the United States.

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