Air raid sirens sounded across China and flags flew at half staff in tribute Saturday to victims of the coronavirus pandemic, including the health care “martyrs” who have died fighting to save others. With the highest number of infections in Europe and their hospitals overwhelmed, Spain and Italy struggled to protect medical staff on the front lines of the outbreak, while 17 medics in Egypt’s main cancer hospital tested positive for the virus. As the number of infections has grown to more than 1.1 million worldwide, health care systems are straining under the surge of patients and lack of medical equipment like ventilators as well as protective masks and gloves, giving rise to growing concerns about the exposure of hospital personnel. Italy and Spain, with combined deaths of more than 25,000 and nearly a quarter-million infections, have reported a high percentage of infections among health care workers. Carlo Palermo, head of Italy´s hospital doctors´ union, fought tears as he told reporters in Rome of the physical risks and psychological trauma the outbreak is causing, noting reports that two nurses had committed suicide. “It´s a indescribable condition of stress. Unbearable,” he said. “I can understand those who look death in the eye every day, who are on the front lines, who work with someone who maybe is infected, then a few days later you see him in the ICU or die.” US President Donald Trump announced late Friday he would prevent the export of N95 protective masks and surgical gloves to ensure they are available in the US – prompting neighboring Canada’s prime minister to respond that cross-border aid goes well beyond supplies. “I think of the thousands of nurses who cross the bridge in Windsor to work in the Detroit medical system every day,” Justin Trudeau said. “These are things Americans rely on.” The number of people infected in the US has now exceeded a quarter-million, with the death toll climbing past 7,000. New York state alone accounts for more than 2,900 dead, an increase of over 560 in just one day. Most of the dead are in New York City, where hospitals are swamped with patients. World Health Organization director-general Tedros Adhanom Ghebreyesus warned African leaders of an “imminent surge” in coronavirus cases on the continent, urging them to open humanitarian corridors to allow the delivery of badly needed medical supplies. More than half of Africa´s 54 countries have closed air, land and sea borders to prevent the virus´ spread but that has delayed aid shipments. Virus cases in Africa are now over 7,700, and the head of the Africa Centers for Disease Control and Prevention has warned some nations will have more than 10,000 cases by the end of April. In the Philippines, Sen. Richard Gordon, who is also head of the local Red Cross, said lockdown measures have meant millions of poor families are unable to fulfill basic needs. “A lot of people are hungry. They´re asking for milk, they´re asking for diapers. They say it´s not going fast enough,” Gordon said, threatening to have local officials arrested if they steal from government aid for dirt-poor families. Eleven Russian military planes carrying disinfection experts landed in Serbia on Saturday, which Serbian Defense Minister Aleksandar Vulin said shows “that we are not alone.” The transport followed last month´s deployment of a similar Russian coronavirus task force to Italy and the delivery of medical supplies to the United States. Russian officials have angrily rejected claims that the Kremlin is seeking political gain by providing aid to other countries. Russia has reported a relatively few 4,700 cases and 43 deaths, and its southern neighbor Georgia said Saturday it has registered its first death from the virus, among 156 confirmed cases of infection.