( CNN ) -- Michigan and federal authorities will coordinate their criminal investigations into a deadly fungal meningitis outbreak that killed 22 people in that state and 64 people total nationwide , the Michigan attorney general and the U.S. attorney for Massachusetts said Monday in Detroit . However , Michigan -- which had the most deaths of any single state in the 2012 outbreak -- will let its own grand jury in the case take a `` temporary pause '' in the probe of the Massachusetts-based New England Compounding Center , Michigan Attorney General Bill Schuette said . The Michigan grand jury has n't announced any indictments and its six-month term is set to expire soon , though a judge could call it back , Schuette said . He emphasized his agreement with the U.S. attorney for Massachusetts , Carmen Ortiz , saying it will ensure state investigators see the evidence that a federal grand jury in Boston is seeing , and vice versa . `` This will help us reach our mutual goal : to secure justice for victims of fungal meningitis , '' Schuette said . `` ... By working together we can ensure our investigative efforts are not duplicated . '' The outbreak , thought to be caused by tainted steroid injections from the New England Compounding Center , infected 751 people in 20 states last year , the Centers for Disease Control and Prevention reported . More than 260 of the infected were Michigan citizens , Schuette said . Massachusetts cracks down on compounding pharmacies . The company filed for bankruptcy last December . A state pharmacy board also voted to permanently revoke the company 's license to operate as well as the licenses of the company 's three principal pharmacists . No one has yet been charged in the case , said Ortiz , who appeared with Schuette at a news conference in Detroit Monday morning . She declined to discuss details of the investigation , but said she is confident in the direction it is going . Symptoms of fungal meningitis can include headache , fever , nausea , stiff neck , new weakness or numbness anywhere in the body , slurred speech , pain or swelling at the injection site and sensitivity to light , according to the CDC . What is a compounding pharmacy ? Compounding pharmacists customize medications to fit an individual 's needs . Doctors prescribe these custom medications when the manufactured drug wo n't work -- for example , when a dosage is too large , or a patient has an allergy to a dye or ingredient in the commonly available product . 8th case of meningitis confirmed at Princeton .
NEW : Michigan , Massachusetts investigators will see each other 's info in outbreak probe . Michigan attorney general : State grand jury on `` temporary pause '' but could be called back . Meningitis outbreak killed 22 people in Michigan in 2012 . It claimed 64 lives in 20 states .