Final answer:
HBV vaccinations provide 90% protection against hepatitis B for at least 10 years after the initial vaccination series. It is particularly important for healthcare workers and other high-risk groups to get vaccinated.
Step-by-step explanation:
Vaccinations against HBV infection provide protection against hepatitis B, an illness with significant health implications. The vaccine is recommended as part of the standard vaccination schedule for children and for adults at greater risk. It is especially important for health-care workers to receive the vaccine due to occupational exposure to blood and other infectious materials. After being vaccinated, people have up to a 90% protection against hepatitis B infection.
The correct answer to the student's question is c) 10 years. Generally, after the initial series of vaccinations (usually three doses), the hepatitis B vaccine provides protective levels of antibodies for at least 10 years in most people. Some individuals, particularly health-care workers or those with continued risk factors, may require booster vaccinations for continued protection.