Few diseases are strictly bloodborne. Most, like hepatitis B and HIV, are also transmitted through intimate contact. Bloodborne diseases are a risk only in workplaces where workers can come into contact with blood or other bodily fluids—most common in medical care delivery and laboratory work. It is also a consideration for employees who provide first aid to other employees or customers. Employers should be careful of hidden blood exposures. Ear piercing in a department store can effectively spread HBV between customers if the instruments are reused without sterilization.