More than 50 people have been killed in attacks along South Sudan's border with Sudan, one of the deadliest related to a boundary dispute. Zimbabwe launches a vaccination campaign against cholera as the country grapples with an outbreak of the disease that has killed more than 400 people. And U.S. President Joe Biden vows to respond after a drone strike by Iranian-backed militias kills three U.S. service members. All this and much more in today’s Africa 54!