Collocations for outbreak - noun

large, major, serious | fresh, further, new | occasional, periodic, sporadic | recurrent, repeated | sudden | cholera, salmonella, etc.

lead to
the events that led to the outbreak of World War I

occur

~ of
A new outbreak of smallpox occurred in 1928.

an outbreak of disease, an outbreak of rain, an outbreak of war/fighting/hostilities/violence