Massachusetts regulators have ordered all pharmacists and pharmacy technicians who worked at the Framingham company linked to the national fungal meningitis outbreak to immed­iately stop working in the drug-compounding industry, a sign that state officials are concerned that its front-line workers might not have followed proper procedures.

An Oct. 31 letter from the Massachusetts Board of Registration in Pharmacy obtained by the Globe states that the investigation of the outbreak had determined that pharmacists and pharmacy technicians employed by the New England Compounding Center “may present an immediate or serious threat to the public health, safety, and welfare and should immediately cease.”