The working group review was triggered last year by the discovery of fungal contamination in two vials from a pharmacy sterile production unit. (sciencemag.org)
The U.K. review noted that a simple activated charcoal filter (like a Brita filter) removed 90 % of fungal contamination in tap water. (mindbodygreen.com)
Micropropagation from tissue cultures, which is faster and requires less propagation material, has also been investigated but is currently dogged by fungal contamination from the parent plant. (newscientist.com)