WENZHOU, Dec. 27 -- Health authorities in east China's Yongjia County, Zhejiang Province said on Friday that they are investigating a new Hepatitis B vaccine-related death.

In the Yongjia County case, a two-month-old boy died one day after receiving a Hep. B shot on Dec. 20.

The vaccine was produced by Dalian Hissen Bio-Pharm Inc. Authorities in Yongjia suspended use of the batch of vaccines on Dec. 23 and the local food and drug administration is investigating the case.

The parents of the boy are from central China's Hubei Province. They had a fight after the baby's death and buried the boy without reporting the case, according to an initial investigation.

The relatives of the boy later reported the case to the local community health service center after other vaccine-related deaths were reported nationwide by media.

The parents agreed on an autopsy of the boy on Friday. The result will out after a month, according to authorities.

To date, nine infants have died following hepatitis B vaccination since November, including four in Guangdong, three in Hunan and two in Sichuan.

The majority came after use of vaccines made by BioKangtai in Shenzhen, Guangdong Province.

Use of all BioKangtai Hep. B vaccines has been suspended nationwide. Authorities are investigating the deaths.