The UN's World Health Organisation is on the hunt for anyone who's had contact with a man who died of Ebola in Nigeria.

Two teams of experts in epidemics are being despatched after Patrick Sawyer died.

The consultant for the Liberian finance ministry collapsed on arrival at the Nigerian capital.

.(SOUNDBITE)(English) WHO'S SPOKESMAN PAUL GARWOOD SAYING:

"We understand that in this part of the world, the borders are very, very porous, so it's quite easy for people to cross from one country into another, without detection, without using a regular border crossings, so, we again see the most effective response to outbreaks such as this is to undertake clinical, laboratory testing, clinical management, contact tracing is essential."

In Lagos, the Nigerian government shut down and quarantined the hospital where Sawyer died.

Authorities are also monitoring 59 people who were in contact with him.

.( SOUNDBITE) (English) LAGOS STATE COMMISSIONER FOR HEA