Only 45 percent of 3,507 health facilities surveyed by WHO were fully functional and accessible, while more than 40 percent of districts faced a "critical" shortage of doctors, WHO said.
"These critical shortages in health services mean that more people are deprived of access to life-saving interventions," WHO said in a statement.
"Absence of adequate communicable diseases management increases the risk of outbreaks such cholera, measles, malaria and other endemic diseases."