China has temporarily halted imports of frozen shrimp from two Ecuadorian companies, Proexpo and Expalsa, and frozen sea snail meat from a Mauritanian company due to detection of coronavirus traces in their products. This follows similar bans on imports from other countries as Chinese authorities seek to prevent the spread of the virus via importted food. These bans are part of China's efforts to tighten import regulations for products from countries still in the pandemic, following detection of the virus in food products last year. Recently, China has seen its worst outbreak since Wuhan, linked to the delta variant and potentially related to imports of products stored in cold chains.