Public Health What It Means When a Disease Is Endemic By Elizabeth Boskey, PhD Elizabeth Boskey, PhD Facebook LinkedIn Twitter Elizabeth Boskey, PhD, MPH, CHES, is a social worker, adjunct lecturer, and expert writer in the field of sexually transmitted diseases. Learn about our editorial process Updated on January 13, 2022 Medically reviewed by Anju Goel, MD, MPH Medically reviewed by Anju Goel, MD, MPH LinkedIn Anju Goel, MD, MPH, is a board-certified physician who specializes in public health, communicable disease, diabetes, and health policy. Learn about our Medical Expert Board Print Table of Contents View All Table of Contents Differences The Flu Malaria Hepatitis B Syphilis HIV COVID-19 An endemic disease is a disease that is always present in a particular population or region. Every year, the amount of endemic disease is considered a “baseline” of what is expected to persist indefinitely. Some of the most recognized endemic diseases include the flu, malaria, HIV, and syphilis. Many experts predict that COVID-19 will become an endemic disease at some point. This article describes what characterizes a disease as “endemic,” how it differs from “epidemic,” and provides examples of endemic diseases that persist in the world today. How Endemic Differs From Epidemic Endemic diseases are often confused with epidemics. However, an epidemic refers to an outbreak of disease that spreads through one or more populations. In contrast, an endemic disease is one that is constantly present in a group or geographic area. Pandemics are worldwide epidemics. Under certain circumstances, an epidemic or pandemic can lead to a disease becoming endemic. What Is the Difference Between an Epidemic and a Pandemic? Prevalence of Endemic Disease Endemic diseases are not always present at high levels. They can also be relatively rare. The defining feature of a regional endemic disease is that it can always be found in the population that lives there. Verywell / Michela Buttignol The Flu Influenza, or the flu, is a respiratory illness caused by seasonal influenza viruses that spread throughout the population each year. Although the flu is endemic, the viruses mutate frequently and are responsible for new seasonal flu strains every year. Most people who get the flu can recover at home with mild symptoms. However, some people with pre-existing conditions, older people, or young children may be at higher risk of more severe illness. Research shows that the influenza virus has been an endemic part of human life for at least 500 years. Today, about 8% of the U.S. population becomes sick with an influenza virus each year. The flu virus spreads via small droplets when infected people talk, cough, or sneeze. Fortunately, yearly flu vaccines are available that protect against each season's top four influenza strains. Most flu vaccines are administered via a shot, but nasal sprays are also available. Types of Flu Vaccines, Explained Malaria Malaria is endemic in many areas of Africa and Asia. Malaria is such a fixture in certain parts of Africa that a protective mutation—sickle cell trait—has become common in local populations. The sickle cell gene makes people less susceptible to malaria. However, it works best when people have one copy of the gene. When they have two, it can cause significant health problems. Hepatitis B Hepatitis B (HBV) is endemic throughout the world. Although HBV is not always a sexually transmitted infection, it can be sexually transmitted. Fortunately, there is a vaccine available to prevent hepatitis B transmission. If a person is planning on traveling to an area where hepatitis is endemic, vaccination is usually recommended. Vaccination against hepatitis is also part of the standard childhood immunization schedule in the United States. Syphilis Syphilis is a sexually transmitted infection that used to be endemic around the world. Fortunately, effective treatments have reduced the number of people infected by this disease. Unfortunately, it appears that rates of syphilis in the U.S. are rising again. However, it's unlikely that syphilis will become endemic again, at least in the U.S. However, it can still lead to significant problems, particularly for newborns. Syphilis is still considered to be endemic in certain parts of Africa. HIV Human immunodeficiency virus (HIV) is considered to be endemic in many parts of Africa. At this point, and for the conceivable future, eradication is unlikely. That's true even as improving treatment is starting to bring the HIV epidemic under control. COVID-19 Coronavirus (COVID-19) is a viral infection caused by the SARS-CoV-2 virus. COVID-19 spreads via droplets from an infected person's mouth or nose as they breathe, speak, cough, or sneeze. As of 2022, COVID-19 is still considered a global pandemic. However, many experts predict that the virus will eventually become an endemic disease. The timeline to endemicity depends on several factors, such as immune protection from vaccinations and natural infection, and how the disease continues to spread or mutate in the future. Fortunately, COVID-19 vaccines are available and have shown to be effective at helping protect people against severe disease and death. The vaccines are available to everyone ages 5 or older. What's It Like to Get a COVID-19 Vaccine? Summary An endemic disease is a disease that is always present in a particular population or region and is expected to remain indefinitely. Some examples of endemic diseases are the flu, malaria, HIV, and syphilis. Researchers predict that COVID-19 will also eventually become an endemic disease. However, the timeline depends on several factors, such as vaccine administration and mutations. A Word From Verywell It's understandable that many people are concerned or even fearful of the current state of the COVID-19 pandemic. Many want to know when the disease will move from pandemic to endemic. While it's impossible to predict, vaccines can help prevent severe illness and death from COVID-19. Contact your healthcare provider for more information about how to get vaccinated. 16 Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Centers for Disease Control and Prevention. Epidemic disease occurrence. Riley LW. Differentiating epidemic from endemic or sporadic infectious disease occurrence. Microbiol Spectr. 2019;7(4). doi:10.1128/microbiolspec.AME-0007-2019 Madhav N, Oppenheim B, Gallivan M, et al. Pandemics: risks, impacts, and mitigation. Disease Control Priorities: Improving Health and Reducing Poverty. 3rd edition. Washington (DC). doi:10.1596/978-1-4648-0527-1/pt5.ch17 Bloom DE, Cadarette D. Infectious disease threats in the twenty-first century: strengthening the global response. Front Immunol. 2019;10:549. doi:10.3389/fimmu.2019.00549 Centers for Disease Control and Prevention. About flu. Taubenberger JK, Morens DM. Influenza: the once and future pandemic. Public Health Rep. 2010;125(Suppl 3):16-26. Centers for Disease Control and Prevention. Key facts about influenza. Centers for Disease Control and Prevention. Seasonal flu vaccines. Depetris-Chauvin E, Weil DN. Malaria and early African development: evidence from the sickle cell trait. Econ J. 2018;128(610):1207–1234. doi:10.1111/ecoj.12433 Franco E, Bagnato B, Marino MG, Meleleo C, Serino L, Zaratti L. Hepatitis B: Epidemiology and prevention in developing countries. World J Hepatol. 2012;4(3):74–80. doi:10.4254/wjh.v4.i3.74 Ventola CL. Immunization in the United States: recommendations, barriers, and measures to improve compliance: part 1: childhood vaccinations. P T. 2016;41(7):426–436. Schmidt R, Carson PJ, Jansen RJ. Resurgence of syphilis in the united states: an assessment of contributing factors. Infect Dis. 2019;12:117863371988328. doi:10.1177/1178633719883282 Kharsany AB, Karim QA. HIV infection and AIDS in sub-saharan Africa: current status, challenges and opportunities. Open AIDS J. 2016;10:34–48. doi:10.2174/1874613601610010034 World Health Organization. Coronavirus. Harvard School of Public Health. What will it be like when COVID-19 becomes endemic? Centers for Disease Control and Prevention. Key things to know about COVID-19 vaccines. By Elizabeth Boskey, PhD Elizabeth Boskey, PhD, MPH, CHES, is a social worker, adjunct lecturer, and expert writer in the field of sexually transmitted diseases. Updated by Sarah Jividen, RN Sarah Jividen, RN Sarah Jividen, RN, BSN, is a freelance healthcare journalist and content marketing writer at Health Writing Solutions, LLC. She has over a decade of direct patient care experience working as a registered nurse specializing in neurotrauma, stroke, and the emergency room. Learn about our editorial process See Our Editorial Process Meet Our Medical Expert Board Share Feedback Was this page helpful? Thanks for your feedback! What is your feedback? Other Helpful Report an Error Submit