The phrase "a spate of cases" is correct and usable in written English.
It is typically used to describe a sudden or large number of occurrences, often in a negative context such as crime or illness.
Example: "The city has seen a spate of cases of vandalism in recent weeks, prompting increased police patrols."
Alternatives: "a surge of cases" or "an outbreak of cases".
The night ended with a spate of cases involving drug abuse and sales.
The action is the latest in a spate of cases brought by American textile, television, furniture and other manufacturers seeking protection against low-priced Chinese competition.
There has been a spate of cases where homebuyers sent deposits to what they thought was a new bank account set up by their solicitors.
However, there has been a spate of cases recently where trade unions have come to an equal pay settlement with the employer, only to find themselves sued by disgruntled women.
In a spate of cases between October 2008 and October 2009 alone, Brooklyn prosecutors arrested 26 ultra-Orthodox men — rabbis, teachers and camp counselors among them — on sexual abuse charges.
South Korea has had a spate of cases in the last month and there have been 1,167 reported incidents of Mers worldwide, of which 479 have died from the disease.
After a spate of new cases in 2010, the Vatican issued new rules saying bishops should report suspected cases of abuse to local police, if required to do so by law.
A spate of recent cases have taken place in schools.
As the C.I.A. scrambles to handle the unveiling of its station chief in Islamabad, a spate of recent cases has cast light on matters farther East.
Residents here are distrustful, saying there has been a spate of cancer cases lately and some fish have been deformed or have washed up dead on the beach.
The FBI, which had recently reopened a spate of cold cases from the civil rights era, added the Monroe lynching to the pile.
