Which of the following is an example of a bloodborne pathogen?

A bloodborne pathogen is defined as a pathogenic microorganism that is present in human blood and can cause disease in humans. These pathogens can be transmitted through contact with blood and other potentially infectious materials.

The hepatitis B virus (HBV) is the correct answer because it is a well-known bloodborne pathogen. It is primarily transmitted through exposure to infectious blood, making it a significant concern in environments such as healthcare and personal service industries. The virus can lead to severe health issues, including chronic liver disease and liver cirrhosis.

In contrast, the other options provided do not fit the definition of bloodborne pathogens. The influenza virus, while contagious and a significant cause of respiratory illness, primarily spreads through respiratory droplets rather than blood. Human papillomavirus (HPV) is mainly transmitted through skin-to-skin contact or sexual activity, not through blood. Lastly, Streptococcus bacteria are typically associated with infections spread through respiratory droplets or direct contact rather than through the blood. Consequently, these other microorganisms do not pose the same bloodborne risk as HBV.