In the green and shaded gardens of the Americo Boavida Hospital in Angola's capital, Luanda, women in colourful printed dresses wait patiently for visiting hours to begin.
It is one of the biggest hospitals in the city, serving almost two million people.
Malaria is the most common killer here, but since December last year they have had to counter another, potentially more dangerous, mosquito-borne virus: Yellow fever.
In its 16 June report, the World Health Organization (WHO) said that 345 people are reported to have died from yellow fever in the last seven months among more than 3,000 cases in Angola.
Not since 1971 has there been such a serious outbreak, and the reasons why it has happened now are complex and many.