Collocations for outbreak - noun

large, major, serious, severe
fresh (esp. BrE), further (esp. BrE), new
recent
occasional, periodic, sporadic
recurrent, repeated
sudden
disease
cholera, flu, salmonella, etc.

cause, lead to
the events that led to the outbreak of war

prevent

occur

outbreak of
A new outbreak of smallpox occurred in 1928.

an outbreak of disease
outbreaks of rain (BrE)
an outbreak of war, fighting, hostilities, violence, etc.