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  • Workers disinfect subway trains against coronavirus in Tehran, Iran, in...

    Workers disinfect subway trains against coronavirus in Tehran, Iran, in the early morning of Tuesday, Feb. 25, 2020. Iran's government said Tuesday that more than a dozen people had died nationwide from the new coronavirus, rejecting claims of a much higher death toll of 50 by a lawmaker from the city of Qom that has been at the epicenter of the virus in the country. (Sajjad Safari/IIPA via AP)

  • In this Sunday, Feb. 23, 2020, photo, sumo wrestlers wearing...

    In this Sunday, Feb. 23, 2020, photo, sumo wrestlers wearing masks arrive at Shin Osaka railway station in Osaka, western Japan. A viral outbreak that began in China has infected more than 79,000 people globally. The World Health Organization has named the illness COVID-19, referring to its origin late last year and the coronavirus that causes it. (Kyodo News via AP)

  • In this Monday, Feb. 24, 2020 photo, Shiite pilgrims wear...

    In this Monday, Feb. 24, 2020 photo, Shiite pilgrims wear masks outside the shrine of Imam Ali in Najaf, Iraq. The Health Ministry said four new cases of coronavirus were diagnosed in the northern province of Kirkuk. It said the afflicted were members of an Iraqi family who had returned from a recent trip to Iran. Iraq announced the discovery of the first coronavirus case in the country on Monday in Najaf. Iraq had earlier closed its border with Iran to Iranian nationals but apparently Iraqis can still cross the boundary. (AP Photo/Anmar Khalil)

  • MILAN, ITALY - FEBRUARY 25: A couple, wearing a respiratory...

    MILAN, ITALY - FEBRUARY 25: A couple, wearing a respiratory mask, walks in the streets on February 25, 2020 in Milan, Italy. Italy is the last country to be hit hard by the virus with 7 dead and more than 283 infected as of today. The spread marks Europes biggest outbreak, prompting the Italian Government to issue draconian safety measures. (Photo by Emanuele Cremaschi/Getty Images)

  • DAEGU, SOUTH KOREA - FEBRUARY 25: In this handout image...

    DAEGU, SOUTH KOREA - FEBRUARY 25: In this handout image provided by South Korean Presidential Blue House, South Korean President Moon Jae-in (3rd R) salutes during a special government meeting to discuss measures to prevent the further spread of COVID-19 at the Daegu City Hall on February 25, 2020 in Daegu, South Korea. Government has raised the coronavirus alert to the "highest level" as confirmed case numbers keep rising. Government reported 144 new cases of the coronavirus (COVID-19) bringing the total number of infections in the nation to 977, with the potentially fatal illness spreading fast across the country. (Photo by South Korean Presidential Blue House via Getty Images)

  • Workers wearing protective suits spray disinfectant as a precaution against...

    Workers wearing protective suits spray disinfectant as a precaution against the coronavirus at a market in Bupyeong, South Korea, Monday, Feb. 24, 2020. South Korea reported another large jump in new virus cases Monday a day after the the president called for "unprecedented, powerful" steps to combat the outbreak that is increasingly confounding attempts to stop the spread. (Lee Jong-chul/Newsis via AP)

  • BEIJING, CHINA - FEBRUARY 25: A Chinese transit worker wears...

    BEIJING, CHINA - FEBRUARY 25: A Chinese transit worker wears a protective mask as he waits at a bus station on February 25, 2020 in Beijing, China. The number of cases of the deadly new coronavirus COVID-19 being treated in China was more than 47000 in mainland China Tuesday, in what the World Health Organization (WHO) has declared a global public health emergency. China continued to lock down the city of Wuhan in an effort to contain the spread of the pneumonia-like disease which medicals experts have confirmed can be passed from human to human. In an unprecedented move, Chinese authorities have maintained and in some cases tightened the travel restrictions on the city which is the epicentre of the virus and also in municipalities in other parts of the country affecting tens of millions of people. The number of those who have died from the virus in China climbed to over 2,666 on Monday mostly in Hubei province, and cases have been reported in other countries including the United States, Canada, Australia, Japan, South Korea, India, Iran, Italy, the United Kingdom, Germany, France and several others. The World Health Organization has warned all governments to be on alert and screening has been stepped up at airports around the world. Some countries, including the United States, have put restrictions on Chinese travellers entering and advised their citizens against travel to China. (Photo by Kevin Frayer/Getty Images)

  • MILAN, ITALY - FEBRUARY 25: Two people, both wearing a...

    MILAN, ITALY - FEBRUARY 25: Two people, both wearing a respiratory mask, stroll along Galleria Vittorio Emanuele II, on February 25, 2020 in Milan, Italy. Italy is the last country to be hit hard by the virus with 7 dead and more than 283 infected as of today. The spread marks Europes biggest outbreak, prompting the Italian Government to issue draconian safety measures. (Photo by Emanuele Cremaschi/Getty Images)

  • Fans wearing masks pose for photos before the start of...

    Fans wearing masks pose for photos before the start of a concert by Japanese girl group Perfume outside Tokyo Dome in Tokyo, Tuesday, Feb. 25, 2020. Japan's Prime Minister Shinzo Abe said Tuesday that new measures like companies letting their employees work from home and hospitals expanding their capacity to treat many patients will determine if Japan could control its coronavirus outbreak. (AP Photo/Jae C. Hong)

  • BEIJING, CHINA - FEBRUARY 24: Chinese men and woman wear...

    BEIJING, CHINA - FEBRUARY 24: Chinese men and woman wear protective masks as they cross a road at rush hour on February 24, 2020 in Beijing, China. The number of cases of the deadly new coronavirus COVID-19 being treated in China was more than 49,500 in mainland China Monday, in what the World Health Organization (WHO) has declared a global public health emergency. China continued to lock down the city of Wuhan in an effort to contain the spread of the pneumonia-like disease which medicals experts have confirmed can be passed from human to human. In an unprecedented move, Chinese authorities have maintained and in some cases tightened the travel restrictions on the city which is the epicentre of the virus and also in municipalities in other parts of the country affecting tens of millions of people. The number of those who have died from the virus in China climbed to over 2,596 on Monday mostly in Hubei province, and cases have been reported in other countries including the United States, Canada, Australia, Japan, South Korea, India, Iran, Italy, the United Kingdom, Germany, France and several others. The World Health Organization has warned all governments to be on alert and screening has been stepped up at airports around the world. Some countries, including the United States, have put restrictions on Chinese travellers entering and advised their citizens against travel to China. (Photo by Kevin Frayer/Getty Images)

  • FILE - In this Tuesday, Feb. 18, 2020, file photo,...

    FILE - In this Tuesday, Feb. 18, 2020, file photo, people wearing masks sit in front of a countdown clock for the Tokyo 2020 Olympics in Tokyo. The Tokyo Olympics open in exactly five months on July 24. But the fast-spreading coronavirus from China is making Tokyo organizers very anxious. Three deaths have been reported in Japan with more than 700 cases, more than 600 from a cruise ship that docked in Japan. (AP Photo/Jae C. Hong, File)

  • BEIJING, CHINA - FEBRUARY 25: A Chinese courier wears a...

    BEIJING, CHINA - FEBRUARY 25: A Chinese courier wears a protective mask as he passes a package to a masked resident through a cutout in a makeshift barricade wall meant to control entry and exit of outsiders to a residential compound on February 25, 2020 in Beijing, China. The number of cases of the deadly new coronavirus COVID-19 being treated in China was more than 47000 in mainland China Tuesday, in what the World Health Organization (WHO) has declared a global public health emergency. China continued to lock down the city of Wuhan in an effort to contain the spread of the pneumonia-like disease which medicals experts have confirmed can be passed from human to human. In an unprecedented move, Chinese authorities have maintained and in some cases tightened the travel restrictions on the city which is the epicentre of the virus and also in municipalities in other parts of the country affecting tens of millions of people. The number of those who have died from the virus in China climbed to over 2,666 on Monday mostly in Hubei province, and cases have been reported in other countries including the United States, Canada, Australia, Japan, South Korea, India, Iran, Italy, the United Kingdom, Germany, France and several others. The World Health Organization has warned all governments to be on alert and screening has been stepped up at airports around the world. Some countries, including the United States, have put restrictions on Chinese travellers entering and advised their citizens against travel to China. (Photo by Kevin Frayer/Getty Images)

  • BEIJING, CHINA - FEBRUARY 24: A Chinese man wears a...

    BEIJING, CHINA - FEBRUARY 24: A Chinese man wears a protective mask as he waits to cross a nearly empty road in the central business district at rush hour on February 24, 2020 in Beijing, China. The number of cases of the deadly new coronavirus COVID-19 being treated in China was more than 49,500 in mainland China Monday, in what the World Health Organization (WHO) has declared a global public health emergency. China continued to lock down the city of Wuhan in an effort to contain the spread of the pneumonia-like disease which medicals experts have confirmed can be passed from human to human. In an unprecedented move, Chinese authorities have maintained and in some cases tightened the travel restrictions on the city which is the epicentre of the virus and also in municipalities in other parts of the country affecting tens of millions of people. The number of those who have died from the virus in China climbed to over 2,596 on Monday mostly in Hubei province, and cases have been reported in other countries including the United States, Canada, Australia, Japan, South Korea, India, Iran, Italy, the United Kingdom, Germany, France and several others. The World Health Organization has warned all governments to be on alert and screening has been stepped up at airports around the world. Some countries, including the United States, have put restrictions on Chinese travellers entering and advised their citizens against travel to China. (Photo by Kevin Frayer/Getty Images)

  • A policeman and pedestrians wear masks to help guard against...

    A policeman and pedestrians wear masks to help guard against the Coronavirus, in downtown Tehran, Iran, Sunday, Feb. 23, 2020. On Sunday, Iran's health ministry raised the death toll from the new virus to 8 people in the country, amid concerns that clusters there, as well as in Italy and South Korea, could signal a serious new stage in its global spread. (AP Photo/Ebrahim Noroozi)

  • People wear masks to help guard against the Coronavirus in...

    People wear masks to help guard against the Coronavirus in downtown Tehran, Iran, Sunday, Feb. 23, 2020. On Sunday Iran's health ministry raised the death toll from the new virus to 8 people in the country, amid concerns that clusters there, as well as in Italy and South Korea, could signal a serious new stage in its global spread. (AP Photo/Ebrahim Noroozi)

  • BEIJING, CHINA - FEBRUARY 22: A Chinese security guard wears...

    BEIJING, CHINA - FEBRUARY 22: A Chinese security guard wears a protective mask as he stands in a nearly empty shopping mall on February 22, 2020 in Beijing, China. The number of cases of the deadly new coronavirus COVID-19 being treated in China was more than 55000 in mainland China Saturday, in what hat the World Health Organization (WHO) has declared a global public health emergency. China continued to lock down the city of Wuhan in an effort to contain the spread of the pneumonia-like disease which medicals experts have confirmed can be passed from human to human. In an unprecedented move, Chinese authorities have maintained and in some cases tightened the travel restrictions on the city which is the epicentre of the virus and also in municipalities in other parts of the country affecting tens of millions of people. The number of those who have died from the virus in China climbed to over 2348 on Saturday mostly in Hubei province, and cases have been reported in other countries including the United States, Canada, Australia, Japan, South Korea, India, the United Kingdom, Germany, France and several others. The World Health Organization has warned all governments to be on alert and screening has been stepped up at airports around the world. Some countries, including the United States, have put restrictions on Chinese travelers entering and advised their citizens against travel to China. (Photo by Kevin Frayer/Getty Images)

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Dai Sugano, staff photojournalist and senior multimedia editor, The Mercury News, for his Wordpress profile. (Nhat V. Meyer/Bay Area News Group)Lisa Krieger, science and research reporter, San Jose Mercury News, for her Wordpress profile. (Michael Malone/Bay Area News Group)
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In a sober warning Tuesday, federal health officials warned that America’s businesses, neighborhoods, schools and families should learn what steps are needed to prepare for the prospect of an outbreak of coronavirus.

This week’s accelerating spread of the virus in Italy, South Korea and Iran reveals the power of the virus to ignite in communities far from China – and preparation will help America reduce its deadly toll, said Dr. Nancy Messonnier, director of the National Center for Immunization and Respiratory Diseases.

These strategies may include making sick-leave policies more flexible in workplace settings, temporarily dismissing schools, avoiding close contact with others, and canceling large public events.

“It’s not so much of a question of if this will happen in this country any more but a question of when this will happen,” she said at a Tuesday press briefing by the Centers for Disease Control and Prevention.  “Ultimately we expect we will see community spread in the United States.”

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