Dengue patients rest at a Dengue Emergency Medical Unit set up by the Philippine Red Cross in Cavite Province, the Philippines, Aug. 13, 2019. On Aug. 6, the Philippines's Department of Health (DOH) declared the dengue outbreak a national epidemic after a surge of dengue cases and deaths in the country. The department has recorded some 146,000 cases of dengue from January through July 20 this year, 98 percent more than the same period in 2018. The outbreak has caused 622 deaths, it added. (Xinhua/Rouelle Umali)

A mother plays with her sick child as they rest with other dengue patients at a Dengue Emergency Medical Unit set up by the Philippine Red Cross in Cavite Province, the Philippines, Aug. 13, 2019.(Xinhua/Rouelle Umali)

A mother attends to her sick child as they rest with other dengue patients at a Dengue Emergency Medical Unit set up by the Philippine Red Cross in Cavite Province, the Philippines, Aug. 13, 2019. On Aug. 6, the Philippines's Department of Health (DOH) declared the dengue outbreak a national epidemic after a surge of dengue cases and deaths in the country. The department has recorded some 146,000 cases of dengue from January through July 20 this year, 98 percent more than the same period in 2018. The outbreak has caused 622 deaths, it added. (Xinhua/Rouelle Umali)

A mother attends to her sick child as they rest with other dengue patients at a Dengue Emergency Medical Unit set up by the Philippine Red Cross in Cavite Province, the Philippines, Aug. 13, 2019. On Aug. 6, the Philippines's Department of Health (DOH) declared the dengue outbreak a national epidemic after a surge of dengue cases and deaths in the country. The department has recorded some 146,000 cases of dengue from January through July 20 this year, 98 percent more than the same period in 2018. The outbreak has caused 622 deaths, it added. (Xinhua/Rouelle Umali)

Dengue patients rest at a Dengue Emergency Medical Unit set up by the Philippine Red Cross in Cavite Province, the Philippines, Aug. 13, 2019. On Aug. 6, the Philippines's Department of Health (DOH) declared the dengue outbreak a national epidemic after a surge of dengue cases and deaths in the country. The department has recorded some 146,000 cases of dengue from January through July 20 this year, 98 percent more than the same period in 2018. The outbreak has caused 622 deaths, it added. (Xinhua/Rouelle Umali)

Dengue patients rest at a Dengue Emergency Medical Unit set up by the Philippine Red Cross in Cavite Province, the Philippines, Aug. 13, 2019. On Aug. 6, the Philippines's Department of Health (DOH) declared the dengue outbreak a national epidemic after a surge of dengue cases and deaths in the country. The department has recorded some 146,000 cases of dengue from January through July 20 this year, 98 percent more than the same period in 2018. The outbreak has caused 622 deaths, it added. (Xinhua/Rouelle Umali)

A father attends to his sick child as they rest with other dengue patients at a Dengue Emergency Medical Unit set up by the Philippine Red Cross in Cavite Province, the Philippines, Aug. 13, 2019. On Aug. 6, the Philippines's Department of Health (DOH) declared the dengue outbreak a national epidemic after a surge of dengue cases and deaths in the country. The department has recorded some 146,000 cases of dengue from January through July 20 this year, 98 percent more than the same period in 2018. The outbreak has caused 622 deaths, it added. (Xinhua/Rouelle Umali)