Fears over the human form of mad cow disease have led hospital pharmacists to check blood products hoping to pinpoint those from Britain. The checks come after 129 patients had to be recalled over the past two months after two cases involving blood products contaminated with the protein causing Creutzfeldt-Jacob Disease (CJD). One of the units came from Britain. British Health Secretary Frank Dobson yesterday told vaccine manufacturers to avoid using British blood products to protect patients from a 'theoretical risk' of contracting CJD. This follows three recalls of blood products last November after donors were found to have contracted CJD. Mr Dobson said the vaccine warning was 'precautionary' and that there was no evidence that the CJD variant could be transmitted through such products. A Hospital Authority spokesman said they were looking at the product list to see how many involved blood components and how many actually came from Britain. 'We will take the advice of the local health authority in Britain, if we need to stop or ban anything,' the spokesman said.