Typhoid vaccine recalled

The Amedis Company, a Swiss drug manufacturer, has recalled a Hong Kong batch of oral typhoid fever vaccine, the Vivotif Enteric Coated Cap, because it may lack potency, though it is believed to carry little risk to users.

All lots of the drug that have been released to the market are still within limits of potency, but the company has used the voluntary recall as a precautionary measure, Xinhua reports.

The product, which has the registration number HK-55557, is an oral typhoid fever vaccine. It could only be sold at dispensaries with a doctors' prescription. Around 402 boxes of the potentially affected product were sold to private hospitals, private medical practitioners and pharmacies, according to Xinhua.

The wholesaler of the drug set up a hotline to answer any public inquiries about the product, according to a statement released by the company.

Typhoid fever is a potentially deadly illness caused by the Salmonella Typhi bacterium. The disease affects close to 21.5 million people each year ,though it is treatable with antibiotics. The symptoms for the condition include sustained high fever, weakness, headache, stomach pain and a loss of appetite. To detect the disease, stool or blood samples must be tested for the presence of the bacteria, according to the Centers for Disease Control.