Even bed bugs take public transportation in New York City.
Metropolitan Transportation Authority officials have found bed bugs on four separate N-line trains, MTA spokesman Kevin Ortiz told CNBC.
Officials also discovered the bugs in two crew locker rooms in Astoria, he said.
All of the trains have been fumigated, and are now back in service, but the MTA is doing "continuous spot checks," he said.
Bed bugs were first discovered on an N-line train over the weekend, WABC-TV reported on Wednesday. At the time of that report, only three train infestations had been discovered and remedied.