Residents in Kinshasa, Democratic Republic of Congo, receive yellow fever vaccines. The World Health Organization routinely spends about $200 million a year on travel, far more than what it doles out to fight some of the biggest problems in public health.

LONDON — Dr. Margaret Chan, director-general of the World Health Organization, traveled to Guinea earlier this month to join the country’s president in celebrating the world’s first Ebola vaccine.

After praising health workers in West Africa for their triumph over the lethal virus, Chan spent the night in the presidential suite at the beach-side Palm Camayenne hotel. The suite, equipped with marble bathrooms and a dining room that seats eight, has an advertised price of 900 euros ($1,008) per night.