The health ministry is urging staffers involved in inoculation programs to be extra careful to prevent vial “coring,” which occurs when a needle is improperly inserted into the rubber stopper ...

But a syringe mostly available in Japan can inject only five people per vial and the needle still contains some vaccine after injection. The leftover fluid is disposed of after each use.

is supplied in a kit containing a vial of risperidone microsphere powder for suspension, a syringe containing diluent, a safety needle, a device for attaching the diluent syringe to the vial ...