A contaminant found in a batch of Moderna Inc's Covid-19 vaccines delivered to Japan is believed to be a metallic particle, Japanese public broadcaster NHK has reported, citing sources at the health ministry.
Japan on Thursday suspended the use of 1.63 million doses shipped to 863 vaccination centres nationwide, more than a week after the domestic distributor, Takeda Pharmaceutical, received reports of contaminants in some vials.
NHK, in a report, cited ministry sources as saying the particle reacted to magnets and was therefore suspected to be a metal. Moderna has described it as “particulate matter” that did not pose a safety or efficacy issue.
