But the Centers for Disease Control and Prevention said that there is no evidence yet.
A spokesperson said in an e-mailed statement to CNN: “Based on the scientific understanding of the virus, it is very likely that many mutations will occur simultaneously on a global scale.”
“Furthermore, there is a very high possibility that there are variants in the United States; however, it may take weeks or months to determine whether a single variant of the virus will cause a surge in COVID-1
“Since the beginning of the pandemic, researchers have been monitoring strains in the United States, including 5,700 samples collected in November and December. To date, CDC researchers and analysts have not seen a strain in the United States. A specific virus variant. B.1.1.7 in the UK or B.1.351 in South Africa.”
It is not clear why the White House issued a printed statement to the states, speculating that a new variant of the virus is emerging across the United States. A government official told CNN’s Jim Acosta (Jim Acosta) that the speculation began with a conference call with the governor.
CNN obtained multiple copies of written statements sent to states last week.
“The number of such autumn and winter dresses is almost twice the growth rate of spring and summer dresses. This sign of acceleration indicates that in addition to British dresses that have spread in our country, American dresses may also appear here. Community, And it may spread more than 50%.”
“Active mitigation measures must be used to match more aggressive viruses; if effective masks (two or three layers and very suitable) and strict social isolation are not implemented uniformly, as these variants spread and become popular, The disease may get worse quickly.”
CDC is tracking examples of variants first seen in the UK. Routine coronavirus testing cannot tell doctors if people are infected with the mutant virus. To do this, laboratories must run more detailed genome tests.
The CDC reported on Friday that so far, 63 cases of infections similar to those in the eight states (California, Colorado, Connecticut, Florida, Georgia, New York, Pennsylvania, and Texas) have been reported. The first variant found in Britain. But the CDC says there may be more.
It is not clear whether these variants may make it easier for people to spread the virus to others, and whether they are promoting the explosive spread of the virus in the United States, parts of Europe and other places.
Compared with influenza, all viruses mutate, and the mutation rate of coronavirus is relatively slow. Researchers have been tracking the changes of the virus on a global scale and putting its findings in such as NextStrain and a public database called GISAID.
Academic researchers also said that they were confused by the White House statement and said that there is no evidence that a variant version of the virus is driving the spread of the virus in the United States.
University of Pennsylvania virus and immunology expert Scott Hensley (Scott Hensley) told CNN: “I don’t know that the variants found in the United States may cause the rise we are seeing.”
Hensley added: “In the fall and winter, there are many reasons for the increase in infection rates.” These include lower temperatures, which allow people to enter the room, and may also produce dry, cooler air, which helps the virus. spread.
He said: “The increase in cases does not necessarily require genetic explanation.”
Trevor Bedford of the University of Washington and the Fred Hutchinson Cancer Research Center, who helped maintain NextStrain, also said that he did not see any evidence of a more positive spread of native American strains.
Bedford, who studies the spread of the virus, said: “We don’t see any signs that any particular bloodline or mutation has caused too many cases in the fall and winter in the United States.”
“There is no specific blood group that is growing and quickly becoming a large part of the epidemic (as seen in the UK and South Africa).”
This does not mean that there will be no variants in the United States. Like many viruses, the coronavirus will change over time and spread more and more. The researchers said, but no specific version can change the speed of transmission.
Hensley said that the more the virus spreads, the more likely it will happen.
He said: “If you are a virus and you have 300,000 targets hit every day, it is very likely that one of these shots will enter. The virus keeps making mistakes in its genome.”
He added: “The level of the virus in our country is out of control.”
“If there are a lot of viruses, there are many opportunities to choose variants. If someone is worried about variants, then your best bet is to limit the number of viruses that are spreading. The best way is by vaccinating people and It is achieved by keeping a distance from society.”