The blockage in the Strait of Hormuz is affecting more than direct shipments of supplies, said Jean Kaseya, the director-general of Africa Centres for Disease Control and Prevention, at a press conference on Thursday. Fuel shortages have increased the cost of transportation and the production of key health commodities like mosquito nets, which are made of polyester, which is made of petrochemicals.

Save the Children CEO Janti Soeripto told NPR that the group has medicines stuck at a supplier’s warehouse in India that need to get to Afghanistan urgently.

“We can’t take the road because there’s also been conflict, which means that is impossible,” Soeripto says. “We would then normally airship it. Those costs have doubled over the last month, because of the price of oil. So now the transport for the drugs is more expensive than the drugs themselves.”