Philippine health authorities have declared a national dengue epidemic. The disease claimed more than 600 lives.
The health ministry said the country registered about 146,000 cases of dengue from January to July 20 this year, including 622 deaths.
Health officials say the affected areas range from around the capital, Manila, to the south of the country. Caution is also recommended for people in the region that includes the island of Cebu, a popular tourist destination.
Dengue is a mosquito-borne viral infection that can cause high fever, headache and joint pain. In severe cases, it can be fatal.
The World Health Organization says it has seen an increase in dengue cases this year, mostly in countries in Southeast Asia, such as the Philippines, Vietnam, Malaysia and Singapore.