A doctor leading the fight against Ebola in Sierra Leone has caught the deadly virus, according to the country's government. Dozens of nurses and other health care works have also fallen ill, in what has been "the largest and most complex outbreak that we have ever seen," said Dr. Keiji Fukuda, assistant director-general of the World Health Organization. The outbreak has infected more than 1,000 people and killed more than 600 in three West African countries.
