Two men died after each was administered a dose of Moderna Inc.'s COVID-19 vaccine that was among lots later suspended from use following the discovery of contaminants, the health ministry said Saturday.
The two men, 30 and 38, died within days of receiving their second shots on Aug. 22 and 15, respectively, and no foreign matter was found in either of the vials of vaccine used on the two men, the ministry said.
It remains unknown if there is any causal relationship between the vaccination and their deaths, the ministry said, adding that neither of them had an underlying medical condition or a history of allergic reactions.
Japan's health ministry said Thursday that foreign substances have been confirmed in 39 unused vials at eight vaccination sites in five prefectures. The same day, it halted the use of around 1.63 million doses, or three lots, which came from the same production line of a Spanish factory, as a precaution.
But Taro Kono, the Japanese minister in charge of the vaccination effort, said Friday that over 500,000 shots have already been administered from the potentially contaminated batches.
The foreign substances had been confirmed since Aug. 16, but Japanese drugmaker Takeda Pharmaceutical Co., which is in charge of the sale and distribution of the Moderna vaccine in Japan, only reported the problem to the ministry on Wednesday.
Moderna and Takeda said in a joint statement Saturday that they were working with the health ministry to investigate the two deaths.
"At this time, we do not have any evidence that these deaths are caused by the Moderna COVID-19 vaccine," the two companies said.
So far, more than 1,000 people in total have died in Japan after being administered a COVID-19 vaccine, but health experts have yet to determine a causal relationship between receiving the vaccine and dying.
Related coverage:
Moderna's contaminated vaccine only shipped to Japan: Spanish maker
Japan halts use of 1.63 mil. Moderna vaccine doses over contamination
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