WHO rules mandate that sterility test isolators undergo detailed revalidation at least every year, or maybe more usually if significant changes or routine maintenance actions have happened. WHO pointers have to have manufacturers to take care of total and correct information of all activities associated with sterility test isolators, https://tailinscitech.wordpress.com/2026/01/16/applications-and-benefits-of-tailin-containment-isolator-for-handling-high-potency-materials/