The mutation did not appear to make the virus more unsafe or change patients' outcomes, according to the study.
The virus could be also under selective pressure to evade the human immune response as people gain immunity either through infections or a vaccine. The more "spikes" on the crown of this mutation allowed it to better adhere to and infect human cells.
But they found little evidence that mutations in the virus have made it deadlier, noting that severity of COVID-19, the disease caused by the virus, was more strongly linked to patients' underlying medical conditions and genetics.
Even if the D614G form of the virus is really more infectious than before, it likely doesn't change things on the ground.
Senior author Dr John M Higgins, an investigator in the department of pathology at Massachusetts General Hospital, said: "We wanted to help find ways to identify high-risk Covid patients as early and as easily as possible - who is likely to become severely ill and may benefit from aggressive interventions, and which hospitalised patients are likely to get worse most quickly".
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In an address to the nation, he said: "We must rely on our willingness to look out for each other, to protect each other". However the number of deaths declined by 10 percent over the previous week to 37,700.
Scientists declare that every new strain of the second wave had a mutation known as D614G.
Theoretically, scientists believe the evolutionary trend viruses are pushed towards is to increase their rate of infection and decrease the severity of symptoms, as viruses need living hosts to survive.
It swiftly rose to the top of the viral food chain in New York City, Italy and the United Kingdom, while the West Coast of the U.S. was primarily battling a strain thought to be 10 times less infectious than D614G. And safe to say, viruses don't tend to mutate tiny hands that can rip through physical barriers like masks.
David Morens, a virologist at the National Institute of Allergy and Infectious Diseases, said the findings suggest that the virus may become more contagious and that this "may have implications for our ability to control it".
The wrong kind of widely spread mutation in the coronavirus could definitely affect any potential treatments or vaccines that we're developing against it. Similarly, no one is anxious about the virus becoming immune to soap and water. But right now, the virus we're facing doesn't seem to be any more - or less - a threat than in the early days of the pandemic, at least based on the research about D614G collected to date.