http://www.cnn.com/2005/HEALTH/conditions/04/08/angola.marbug/index.html

(CNN) -- The World Health Organization is investigating an outbreak of hemorrhagic fever in northwestern Angola, it said Friday.

As of Thursday, 205 cases of Marburg hemorrhagic fever had been reported in the country, and 180 of those affected had died. Seven provinces have been affected, the latest being Zaire province, where six cases have been reported, the WHO said in its most recent update.

"It is a very, very dangerous and lethal virus in human beings," Mike Ryan, director of alert and response operations for WHO, told CNN. The virus -- in the same family as the Ebola virus -- spreads through blood and body fluid contact.

In this case -- only the second natural outbreak of the virus -- there is evidence it has been amplified through ineffective containment in hospitals, Ryan said.