BEIJING -- Another four teams of more than 205 Chinese medical workers and health officials will leave for West Africa late Friday to help in the fight against Ebola.

They will provide treatment and share preventive measures with the people in the three hardest-hit countries -- Guinea, Liberia and Sierra Leone.

To date, China has sent more than 300 staff to West African countries, and about 1,000 medical workers and public health experts are on stand-by.

The Chinese government has also provided these countries with financial and material aid, totaling 750 million yuan ($122 million).

The construction of a diagnosis and treatment center in Liberia, with the help of China, is expected to be finished on Nov. 25, according to Mao Qun'an, spokesman for National Health and Family Planning Commission.

Mao said China's medical aid for west Africa was the largest given by any country and it would help consolidate and develop the traditional friendship between China and the African nations.