Maps of Angola showing month-to-month spread of yellow fever. Courtesy the World Health Organization. Yellow fever is a persistent problem in West Africa, where the virus cycles between monkeys ...

L ONDON — The World Health Organization says the ongoing outbreak of yellow fever in central Africa is “serious and of great concern” but does not warrant being declared a global emergency.

The seasonal influence of climate and environment on yellow fever transmission across Africa. PLOS Neglected Tropical Diseases , 2018; 12 (3): e0006284 DOI: 10.1371/journal.pntd.0006284 Cite This ...