The hepatitis B virus (HBV) is one of the primary causes of hepatitis, an infection which causes inflammation of the liver. Complications of hepatitis include cirrhosis (scarring) of the liver, liver cancer, and liver failure. There is no known cure for the hepatitis B virus. In the United States, approximately 15 to 25 percent of people infected with HBV will die because of the illness.
According to the hepatitis B Foundation, thousands of people in the United States and 600,000 people worldwide die from hepatitis B-related liver disease annually.
The Center for Disease Control (CDC) reported 2,953 confirmed acute cases of hepatitis B in 2014. The CDC estimates 19,200 people were infected with the hepatitis B virus the same year.
The Center for Disease Control (CDC) reported 3,374 confirmed acute cases of Hepatitis B in 2010. The CDC estimates 38,000 people were infected with the Hepatitis B virus the same year.
Hepatitis B can be either acute or chronic.
Symptoms of HBV infection include, but are not limited to:
Jaundice, a symptom of hepatitis B, often first appears in the eyes.
Jaundice, also called icterus, is a yellowing of the skin or eyes and occurs in the more serious phase of hepatitis B virus. Hepatitis B can damage the liver, resulting in decreased liver function. As the liver's ability to filter waste from the blood decreases, the concentration of waste in the blood increases.
Only about 30 to 50 percent of individuals infected with hepatitis B virus show symptoms. It is important to understand even without symptoms, HBV-infected individuals are still infectious to others.
An exposure that might place a worker at risk for HBV, HCV, or HIV infection is defined as:
Indirect exposure from contaminated objects is a risk, because hepatitis B virus can remain infectious on environmental surfaces for up to a week (7 days) in the form of dried blood.
This means you must always treat blood, wet or dry, as infectious!
A vaccination to prevent hepatitis B virus infection is available. The hepatitis B vaccine series is a sequence of three shots that stimulate a person's natural immune system to protect against the virus. After the vaccine is given, the body makes antibodies to protect a person against the virus. Antibodies are specialized proteins found in the blood that produce an immune response to a virus invading the body. These antibodies are stored in the body to guard against future infections. They will fight off an infection if a person is exposed to the hepatitis B virus in the future.
Michelle is a custodian in a public elementary school. At the end of each school day, she cleans and vacuums the building, including the schools health room. While cleaning the health room she notices some dried blood on the floor.
Yes. Any blood, wet or dry, has the potential to carry infectious Hepatitis B virus. As a result, Michelle must take precautions to prevent potential exposure to bloodborne pathogens, including Hepatitis B virus.
The hepatitis C virus (HCV) is also a significant cause of severe liver damage and death.
Hepatitis C kills more Americans than any other infection disease. Deaths associated with hepatitis C reached 18,153 in 2016, according to surveillance data released by the Centers for Disease Control and Prevention (CDC).
About 3.5 million Americans are currently living with hepatitis C and roughly half are unaware of their infection. Approximately 1 to 5% of people infected with hepatitis C virus die as a result of the long-term damage caused to the liver and body.
Approximately 70%-80% of people with acute Hepatitis C do not have any symptoms. Some people, however, can have mild to severe symptoms soon after being infected, including:
If symptoms do occur, the average incubation period is 45 days after exposure, but this can range from 14 to 180 days.
Many people infected with the hepatitis C virus do not develop symptoms.
Hepatitis C virus-infected individuals are infectious to other people, whether they show symptoms or not. Interestingly, hepatitis C virus is strictly a human disease. It is not known to cause disease in any animals.
Blood testing for hepatitis C virus was not available until 1992. As a result, blood donation agencies did not screen for Hepatitis C virus. Many hepatitis C virus infections occurred as a result of receiving blood products from infected individuals. Today, testing for hepatitis C is common place and should occur after any exposure to potential bloodborne pathogens has occurred.
There is no vaccine for hepatitis C.
According to the CDC, approximately 15% to 25% of people infected with acute hepatitis C will naturally be able to clear the infection from their body without treatment.
There are several medications available to treat chronic Hepatitis C, including newer, more effective drugs with fewer side effects.
According to the World Health Organization (WHO), 1.75 million people are infected with the hepatitis C virus each year. Approximately 71 million people are chronically infected and at risk of developing liver cirrhosis and/or liver cancer. About 400,000 people worldwide die from hepatitis C-related liver diseases each year.
Any blood spills - including dried blood, which can still be infectious - should be cleaned using a dilution of one-part household bleach to 10 parts water. Gloves should be worn when cleaning up blood spills.
Manuel is a nurse working nights in the local hospital. During a shift in the emergency department he is stuck with a used needle that punctures his skin and draws blood.
Yes. After a needlestick or sharps exposure to Hepatitis C-positive blood, the risk of infection is approximately 1.8%. Manuel should immediately report the potential exposure and follow his employer's exposure control plan to ensure he receives proper medical treatment and testing.
The Human Immunodeficiency Virus (HIV) is the virus responsible for causing Acquired Immunodeficiency Syndrome (AIDS). The HIV virus was originally identified on December 1st, 1981.
The human immunodeficiency virus attacks and suppresses the immune system, reducing a person's ability to fight infection. The virus specifically targets the cells crucial for fighting infection from pathogens. This allows diseases and infections to progress without resistance.
Within a few weeks of being infected with HIV, some people develop flu-like symptoms that last for a week or two, but others have no symptoms at all. People living with HIV may appear and feel healthy for several years. However, even if they feel healthy, HIV is still affecting their bodies. Untreated early HIV infection is also associated with many diseases including cardiovascular disease, kidney disease, liver disease, and cancer.
Stacy is a police officer employed by the city of Denver, Colorado. She is regularly required to respond to emergency medical situations, often arriving before the local ambulance company. As a result, Stacy is frequently exposed to human blood.
No. If Stacy follows universal precautions she is not likely to contract HIV. Universal precautions involve the use of protective barriers such as gloves, gowns, aprons, masks, or protective eyewear, which can reduce the risk of exposure of the first aid provider´s skin or mucous membranes to potentially infective materials.
It can take many years before an HIV-infected person displays symptoms of the disease.
As with Hepatitis B virus and Hepatitis C virus, it is important to understand that individuals with HIV are potentially infectious to others, even though they may have no observable symptoms.
Presently, there is no known cure for HIV. Although the life expectancy for HIV-infected individuals has increased due to recent advances in treatment, the end result of HIV/AIDS is premature death.
HIV cannot reproduce outside the human body. It is not spread by:
All reported cases suggesting new or potentially unknown routes of transmission are thoroughly investigated by state and local health departments with assistance, guidance, and laboratory support from CDC.
Of the three major bloodborne pathogens, hepatitis B virus is the most contagious. Approximately 33% of individuals exposed to hepatitis B virus will become infected. Of those individuals exposed to hepatitis C virus, only about 2% will become infected. Comparatively, human immunodeficiency virus is much less contagious than either form of hepatitis. About 0.33%, or 1 in 300, people exposed to HIV will become infected with the virus. Despite these statistics, every exposure has the potential to transmit bloodborne pathogens and must be considered significant.
Before beginning this quiz, we highly recommend you review the module material. This quiz is designed to allow you to self-check your comprehension of the module content, but only focuses on key concepts and ideas.
Read each question carefully. Select the best answer, even if more than one answer seems possible. When done, click on the "Check Your Answers" button. If you do not answer all the questions, you will receive an error message.