With more countries detecting radioactive contamination in food imported from Japan, efforts to prevent it spreading through the global food chain have gained a new urgency.
On Friday, Taiwan and South Korea joined the list of countries that have banned the import of food produced in the provinces worst-hit by the crisis at the Fukushima nuclear plant.
Taiwan was among the first to detect mild levels of radiation in a shipment of fava beans, but decided to ban imports only after radiation was also found in a batch of imported Japanese clams, tested Thursday.