The number of corona19 confirmed cases in the United States is falling sharply.



According to the U.S. Johns Hopkins University, as of the 15th local time, the United States accounted for 27 million, 25% of the 191 million cumulative corona19 confirmed cases worldwide, and 480,000, 20% of the 2.4 million deaths. It is the country with the most deaths.



However, recent changes have occurred in the spread of infection.



As of the 12th, the average number of new confirmed cases per day for the last week was 96,000, down below 100,000 for the first time in 101 days since November 3 last year.



On the 2nd of last month, the number of new infections soared to 300,000,282 a day, and after peaking, the trend is stabilizing by drawing a downward curve.



The Washington Post says the worst surge is an encouraging sign of finally calming down, but scientists disagree over the cause.



First of all, the impact of social distancing has been strengthened since the inauguration of Joe Biden's administration.



President Biden took the lead in complying with the quarantine guidelines, including the '100 Day Mask Wear Campaign', and strengthened various regulations.



Tom Frieden, former director of the CDC Center for Disease Control and Prevention, appeared on a broadcast and saw that it was the result of correct actions such as social distancing, wearing a mask, and stopping travel.



There are also interpretations that the result of expanding the corona 19 vaccination.



According to the CDC, as of the 14th, 53 million doses have been administered.



Of these, 14 million people finished 2 doses, and 38 million people completed 1 dose.



In particular, with an increase in the number of vaccinations, an average of 1.6 million vaccinations per day for the last week, which is evaluated as a green light for President Biden's goal of 100 million vaccinations for 100 days of inauguration.



Some also cite seasonal factors.



Corona 19 virus spreads faster in cold weather, saying that the'worst dark winter' is coming to an end.



The University of Washington Medical School's Institute of Health Quantitative Analysis predicted that there is a possibility of a decline until August, the summer, after citing two causes of the sudden decrease in confirmed cases: continuous expansion of vaccinations and seasonal factors.



On the other hand, there is an analysis that the number of tests was reduced as interest in the suppression of Corona 19 shifted to expanding vaccination.



The'Corona Tracking Project', which has collected Corona 19 test data, revealed that the number of tests per day has decreased from more than 2 million in mid-January to about 1.6 million at present.



However, despite the sharp drop in corona 19 confirmed cases, experts are making a voice that it is not a situation to be relieved because the number of cases is still high.



In particular, the discovery of mutations from the United Kingdom and South Africa, which are known to be much more contagious, is also adding to the burden.



There has even been a warning that in March, mutations from the UK will become the dominant virus in the United States.



Director Wallensky warned of optimism, saying that the current level of confirmed cases is twice as many as in the summer of last year.



"It's not yet anywhere outside the forest," said former Director Frieden. "It's up to us if there's another surge."



(Photo = Getty Image Korea)