The World Health Organization has authorized the use of experimental drugs to fight Ebola, with the death toll topping 1,000 and a Spanish priest becoming the first European to succumb to the outbreak.

The declaration by the UN's health agency came after a US company that makes an experimental serum called ZMapp said it had sent all its available supplies to hard-hit West Africa.

In addition, the Public Health Agency of Canada said it will donate up to 1,000 doses of an experimental, Canadian-made vaccine to be used in response to the outbreak, The Globe and Mail reported in Toronto on Tuesday.