Giardia Infection: Causes and How It Spreads (2024)

Causes

Giardia infections are caused by the parasite Giardia duodenalis (Giardia for short). A parasite is a type of germ that gets its food from, or at the expense of, its host. Parasites live on or in a host (for example, a person or animal).

Giardia is protected by an outer shell called a cyst. This outer shell allows it to survive outside the body for weeks to months (for example, in soil or water). It also helps protect Giardia from being killed by chlorine disinfectants like bleach.

Giardia lifecycle

Giardia can be in water or food, or on hands, surfaces, or objects. You can get sick when you swallow Giardia germs.

Once the Giardia germs are in your small intestine (part of your gut), they shed their shell and split in two. These Giardia germs start absorbing nutrients from you.

Giardia germs can continue to multiply in your small intestine.

The germs then move to your colon (lower gut) and regain their shell.

Giardia leaves your body through poop. The Giardia in your poop can spread to other people and make them sick.

Giardia Infection: Causes and How It Spreads (1)

SOURCE:

Dr. Stan Erlandsen

Keep Reading:Giardiasis

How it spreads

Giardia spreads easily; swallowing just a few Giardia germs can make you sick.

Giardia germs are in poop of people or animals who are infected, so anything that gets contaminated by human or animal poop can potentially spread the germs. Giardia can spread from one person to another. It can also spread through contaminated water, food, surfaces, or objects.

You can get sick from Giardia by:

  • Having close contact with someone who is sick from Giardia, especially in childcare settings
    • Swallowing water contaminated with Giardia, such as lake, pool, or unsafe drinking water
      • Swallowing food contaminated with Giardia
        • Having contact with poop during sex with someone who is sick, or was recently sick, from Giardia
          • Getting Giardia in your mouth that you picked up from contaminated surfaces, such as bathroom handles or toys
            • Touching animals that have a Giardia infection or animal environments that are contaminated with poop

              Anyone can get sick from Giardia, but children get sick more often than adults. Learn if you may be more likely to get sick.

              If your pet has a Giardia infection‎

              Although animals can spread Giardia to people, you are unlikely to get a Giardia infection from dogs or cats. The type of Giardia that makes people sick is usually not the same type that makes dogs and cats sick.

              If you have a private well

              If poop gets into the water supply for your private well, your water can get contaminated with Giardia and other germs. This can happen from:

              • Sewage overflows
                • Nearby septic or other sewage systems that are not working correctly
                  • Polluted flood or storm water

                    Your well may be more likely to get contaminated with poop and germs after flooding if it is:

                    • Shallow
                      • Bored or dug
                        • Covered with floodwater for a long time

                          Learn how to test your well to make sure your water is safe to drink.

                          Giardia Infection: Causes and How It Spreads (2024)

                          FAQs

                          Giardia Infection: Causes and How It Spreads? ›

                          Giardia germs are in poop, so anything that gets contaminated by poop can potentially spread the germs. Giardia can spread from one person to another or through contaminated water, food, surfaces, or objects. Giardia spreads easily; swallowing just a few Giardia germs can make you sick.

                          What is the cause of Giardia disease? ›

                          Giardia infection is caused by a microscopic parasite that is found worldwide, especially in areas with poor sanitation and unsafe water.

                          What is the primary source of Giardia infection? ›

                          Spread: Giardia is principally spread person-to-person. Persons become infected by fecal-oral transfer of cysts from the feces of an infected individual, especially in institutions and child care centers. Transmission can also occur person-to-person through certain types of sexual contact (e.g., oral-anal contact.

                          What type of infectious agent causes Giardia? ›

                          Giardiasis is caused by the flagellate protozoan Giardia intestinalis (formerly known as G lamblia or G duodenalis). Infection is transmitted through ingestion of infectious G lamblia cysts.

                          What kills Giardia in humans? ›

                          Metronidazole is the most commonly used antibiotic for giardia infection. Side effects may include nausea and a metallic taste in the mouth. Don't drink alcohol while taking this medication. Tinidazole (Tindamax).

                          What is the most common way to get Giardia? ›

                          Giardia germs are in poop of people or animals who are infected, so anything that gets contaminated by human or animal poop can potentially spread the germs. Giardia can spread from one person to another. It can also spread through contaminated water, food, surfaces, or objects.

                          How did I catch Giardia? ›

                          Giardia germs are in poop, so anything that gets contaminated by poop can potentially spread the germs. Giardia can spread from one person to another or through contaminated water, food, surfaces, or objects. Giardia spreads easily; swallowing just a few Giardia germs can make you sick.

                          Can Giardia go away on its own? ›

                          Untreated Giardia infection often goes away by itself. But if it doesn't, it can cause long-term complications for your digestive system, and even your immune system. It's important to see a healthcare provider if you have symptoms lasting longer than six weeks.

                          How long is Giardia contagious in humans? ›

                          A person with the disease is contagious for the entire time they are infected, which may last many months. If you get it once, can you get it again? Yes. Being infected with Giardia does not seem to protect you from getting infected again.

                          What are the long-term symptoms of Giardia? ›

                          Occasionally, Giardia infection causes long-term symptoms that can last for years. Complications and long-term symptoms can include: Reactive arthritis (joint pain) Irritable bowel syndrome, which causes stomach pain and other symptoms.

                          What can be mistaken for giardiasis? ›

                          Cryptosporidium and giardia have similar symptoms. You need to see a doctor to find out which disease you have.

                          How long can Giardia live in a house? ›

                          At room temperature (around 25°C/77°F), Giardia can survive for approximately 1 week (7 days). In a dry, warm environment that experiences direct sunlight, Giardia can survive for only a few days 8,9. In a moist, cool environment, Giardia can survive for up to several weeks.

                          What foods should you avoid if you have Giardia? ›

                          Eat slowly and avoid foods that are hard to digest or may irritate your stomach, such as foods with acid (like tomatoes or oranges), spicy or fatty food, meats, and raw vegetables. You may be able to go back to your normal diet in a few days.

                          What does Giardia poop look like? ›

                          Symptoms of giardiasis may include: Explosive, watery, foul-smelling stools. Greasy stools that tend to float.

                          Why is Giardia so hard to treat? ›

                          Thus, drug resistance in Giardia is the ability of this parasite to survive in the presence of an antimicrobial drug dose that would normally kill it or limit its growth.

                          Can Giardia live on clothes? ›

                          Since Giardia cysts can persist in the environment, decontamination of the environment is critical to preventing reinfection. Thoroughly wash your hands, clothes, and any objects and surfaces that your sick pet has been in contact with to avoid spreading the parasite to other pets.

                          What foods can you get Giardia from? ›

                          An infection with Giardia is known as giardiasis. When it comes to food, you get giardiasis most commonly by eating undercooked pork, lamb, or wild game. Symptoms of infection include cramps, gas, diarrhea, and nausea.

                          Can Giardia be an STD? ›

                          However, since the past 30 years of the last century, epidemiology and natural history studies have led to improved understanding of giardiasis as a STI, as a result of oral–anal sexual contact. Studies suggest that Giardia is an increasingly recognized infection that may be underdiagnosed under the STI context.

                          What animals cause Giardia? ›

                          Giardiasis infection occurs in a wide variety of domestic and wild mammal species including dogs, cats, cattle, sheep, goats, horses, pigs, beavers, coyotes, non-human primates, rodents, and raccoons.

                          Top Articles
                          Best Travel Insurance Plans In India 2024
                          Is $70,000 a good salary in Vancouver, British Columbia in 2024?
                          Davita Internet
                          Skycurve Replacement Mat
                          What spices do Germans cook with?
                          Mackenzie Rosman Leaked
                          PontiacMadeDDG family: mother, father and siblings
                          Linkvertise Bypass 2023
                          Craigslist Furniture Bedroom Set
                          According To The Wall Street Journal Weegy
                          Fnv Turbo
                          Violent Night Showtimes Near Amc Fashion Valley 18
                          Valentina Gonzalez Leaked Videos And Images - EroThots
                          Chastity Brainwash
                          Pwc Transparency Report
                          United Dual Complete Providers
                          Buy PoE 2 Chaos Orbs - Cheap Orbs For Sale | Epiccarry
                          Gino Jennings Live Stream Today
                          Craigslist Panama City Fl
                          Echat Fr Review Pc Retailer In Qatar Prestige Pc Providers – Alpha Marine Group
                          Why Does Lawrence Jones Have Ptsd
                          Program Logistics and Property Manager - Baghdad, Iraq
                          The Tower and Major Arcana Tarot Combinations: What They Mean - Eclectic Witchcraft
                          Craigslistodessa
                          Craigslist Roseburg Oregon Free Stuff
                          Churchill Downs Racing Entries
                          Violent Night Showtimes Near Johnstown Movieplex
                          Sensual Massage Grand Rapids
                          Abga Gestation Calculator
                          Speechwire Login
                          Taylored Services Hardeeville Sc
                          Craigslist Boerne Tx
                          Downloahub
                          Tmj4 Weather Milwaukee
                          Justin Mckenzie Phillip Bryant
                          How to Watch the X Trilogy Starring Mia Goth in Chronological Order
                          Case Funeral Home Obituaries
                          Babylon 2022 Showtimes Near Cinemark Downey And Xd
                          19 Best Seafood Restaurants in San Antonio - The Texas Tasty
                          Lbl A-Z
                          Gopher Hockey Forum
                          Isabella Duan Ahn Stanford
                          Owa Hilton Email
                          Mbfs Com Login
                          Dragon Ball Super Card Game Announces Next Set: Realm Of The Gods
                          Paradise leaked: An analysis of offshore data leaks
                          Oak Hill, Blue Owl Lead Record Finastra Private Credit Loan
                          BYU Football: Instant Observations From Blowout Win At Wyoming
                          Thrift Stores In Burlingame Ca
                          Famous Dave's BBQ Catering, BBQ Catering Packages, Handcrafted Catering, Famous Dave's | Famous Dave's BBQ Restaurant
                          Latest Posts
                          Article information

                          Author: Dan Stracke

                          Last Updated:

                          Views: 5926

                          Rating: 4.2 / 5 (43 voted)

                          Reviews: 90% of readers found this page helpful

                          Author information

                          Name: Dan Stracke

                          Birthday: 1992-08-25

                          Address: 2253 Brown Springs, East Alla, OH 38634-0309

                          Phone: +398735162064

                          Job: Investor Government Associate

                          Hobby: Shopping, LARPing, Scrapbooking, Surfing, Slacklining, Dance, Glassblowing

                          Introduction: My name is Dan Stracke, I am a homely, gleaming, glamorous, inquisitive, homely, gorgeous, light person who loves writing and wants to share my knowledge and understanding with you.