An unseen species who donate special tissue samples for use against Correllium fever on Nahmi IV, the cargo whose leaking container endangers the Enterprise-D in Hollow Pursuits.
The Mikulaks are a people on friendly terms with the Federation. They are not shown on screen and are known only for the medical gift they provide: tissue samples that can be used to fight an outbreak of Correllium fever.
They are mentioned in the Next Generation episode Hollow Pursuits. The Enterprise takes aboard canisters of Mikulak tissue to deliver to Nahmi IV, and one of them is found to be faulty in the cargo bay, where an antigravity unit also fails.
A string of odd malfunctions follows, ending with the ship accelerating out of control. Reginald Barclay works out that crew who handled the broken container carried traces of invidium, a substance once used in medical containment fields, around the ship. Cooling the contaminated systems makes it inert.