The Philippines started nine-month clinical trials for Avigan on Monday to study the efficacy of the Japanese anti-flu drug against the disease caused by the new coronavirus.

Health Undersecretary Maria Rosario Vergeire said the clinical trials will include just four hospitals in Metro Manila initially but more will be included in the future.

"The list of hospitals will be expanded for us to be able to have these 100 patients who will receive the allocated drugs coming from the Japanese government," Vergeire told a news conference, adding that they have sufficient stocks of the drug.