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ATLANTA, Ga. – The Centers for Disease Control said Tuesday that it appears inevitable that COVID-19 will spread in United States communities. Officials said it’s no longer a matter of if, but when. Dr. Nancy Messonnier, director of the CDC’s National Center for Immunization and Respiratory Diseases, said during a conference call that the spread of the new coronavirus in countries other than China has officials concerned about outbreaks in the U.S. "Ultimately we expect we will see community spread in this country," said Messonier. "It’s not so much a question of if this will happen anymore, but rather more a question of exactly when this will happen and how many people in this country will have severe illness."The CDC says the agency is preparing to address the potential spread of the virus in the U.S. and it's encouraging Americans to begin planning as well. "We will maintain, for as long as practical, a dual approach where we continue measures to contain this disease, but also employ strategies to minimize the impact on our communities," said Messonier.Messonier said that officials don't know whether the spread of the disease in the U.S. would be mild or severe, but Americans should be ready for "significant disruptions" to their daily lives.“We are asking the American public to prepare for the expectation that this might be bad,” Messonnier said.If the virus begins to spread amongst Americans, the CDC says it will becomes increasingly important to implement basic precautions to prevent more infections. That includes staying home when ill and practicing respiratory and hand hygiene. Additionally, the CDC says community level intervention might include school dismissals and social distancing in other settings, like postponing or canceling large gatherings. Officials said it may become necessary for students and the workforce to meet over the internet, instead of in person.“For adults, businesses can replace in-person meetings with video or telephone conferences and increase teleworking options,” said Messonier. The virus is believed to have originated from Wuhan, China, where early patients had some link to a large seafood and live animal markets. The CDC says more than 2,400 people have died from COVID-19 worldwide, with a majority of the deaths in mainland China. However, other countries are now battling sizable outbreaks as well. Europe’s biggest outbreak is in Italy, where more than 280 people have reportedly been infected. Iran has reported at least 95 cases. And, South Korea has more than 970 cases. As of Tuesday, the CDC had confirmed 14 cases in the U.S., 12 being travel-related and two from person-to-person spread. A total of 43 cases have been confirmed in the group of people repatriated to the U.S. from either Wuhan or the Diamond Princess cruise ship off the coast of Japan, the CDC says. That's a total of 57 cases.At this time, there’s no vaccine or medicine to help stop the spread of the virus.“In the absence of a vaccine or therapy, community mitigation measures are the primary method to respond to widespread transmission and supportive care is the current medical treatment,” wrote the CDC. Symptoms of COVID-19 are similar to those of influenza (fever, cough, and shortness of breath) and the current outbreak is occurring during a time of year when respiratory illness are highly prevalent. The CDC is hoping COVID-19 is a seasonal disease like the flu, but officials are preparing in case it’s not. 3487

As computers, tablets and cellphones have become a growing part of our lives, the exposure to blue light emitted from these devices increases. While blue light exposure has been known to cause strain in eyes, Oregon State University researchers studied the effect of blue light exposure on aging. Based on to their findings, exposure to blue light could cause aging to accelerate. For their study, researchers used common fruit flies and exposed them to 12 hours of blue LED light and 12 hours of darkness. To compare, researchers kept a group of flies in total darkness, as well as a group of flies that were exposed to light that had the blue wavelengths filtered out. The researchers said they chose fruit flies because their cellular and developmental mechanisms are similar to humans.The researchers said that flies exposed to blue LED light sustained damage to their retinal cells and brain neurons and had impaired locomotion. Even more stunning, some of the flies, which exhibited some brain damage, were mutants that did not develop eyes."The fact that the light was accelerating aging in the flies was very surprising to us at first,” said Jaga Giebultowicz, a professor of integrative biology at Oregon State. “We’d measured expression of some genes in old flies, and found that stress-response, protective genes were expressed if flies were kept in light. "We hypothesized that light was regulating those genes. Then we started asking, 'what is it in the light that is harmful to them,' and we looked at the spectrum of light. It was very clear cut that although light without blue slightly shortened their lifespan, just blue light alone shortened their lifespan very dramatically.” 1708

Boeing is cutting more than 12,000 jobs through layoffs and buyouts, with several thousand more jobs expected to be cut over the next few months as the aircraft deals with a downturn in travel caused by the coronavirus pandemic. The company said Wednesday it will lay off 6,770 U.S. workers this week, and another 5,520 employees are taking buyouts. Boeing had already said it would cut 10% of a workforce that numbered about 160,000. The layoffs are expected to be concentrated in the Seattle area, home to Boeing's big commercial-airplanes business.The Chicago-based company says its defense business is stable and will help blunt the impact of falling demand for passenger jets. 693

Be warned: This holiday season will be the busiest on highways in U.S. history, AAA says. This is in addition to 2019 being the busiest holiday travel period at the nation's airports in 16 years.A record 115.6 million Americans are expected to travel from Saturday, Dec. 21 through Wednesday, Jan. 1. The figure is expected to be the largest since AAA began tracking holiday travel. AAA estimates 104.8 million will travel by car, a record according to AAA, in addition to 6.97 million who will travel by plane and 3.81 million who will travel by train. AAA said there are a number of reasons why travel is expected to be high this holiday season. “Holiday cheer is at an all-time high this year, with unemployment at historically low levels, and noted improvements in both disposable income and household net worth,” said Paula Twidale, vice president, AAA Travel. “Travelers should be getting used to crowded highways and airports, as this marks the eighth straight year of new record-high travel volumes for the year-end holidays.”One bit of good news for travelers is that gas prices are expected to continue dropping through the holidays, although the national average will likely be slightly higher than last December's average of .37 per gallon. 1266

Brett McGurk, the special presidential envoy for the global coalition to counter ISIS, submitted his resignation Friday, because of the President's decision to pull US forces out of Syria, according to a senior administration official.McGurk had previously said privately he was going to leave the administration in February of next year.This comes one day after Defense Secretary James Mattis had resigned in part due to the Syria decision.This story is breaking and will be updated. 496

来源：资阳报