ALTHOUGH Shanghai industrial and commercial authorities confirmed that frozen dumplings sold in Shanghai stores are safe, some local supermarkets nevertheless removed two brands of dumplings yesterday, as they are feared to contain harmful bacteria.Over the weekend, their counterparts in Guangzhou, capital of Guangdong Province, said three types of Sanquan frozen dumplings and a type of Hai Pa Wang dumplings were found to contain golden staph - bacteria that can cause pneumonia and blood poisoning.