About Giardiasis (Giardia Intestinal Infection)

Overview

Giardiasis is a parasitic diarrheal disease caused by the parasite giardia intestinalis, also known as giardia lamblia or giardia duodenalis. It is a common gastrointestinal illness that affects both humans and animals. The disease is transmitted through the ingestion of cysts by the fecal-oral route meaning fecal particles pass from one person to the mouth of another. Symptoms of giardiasis may include diarrhea, abdominal pain, weight loss, vomiting, blood in the stool, and fever. It is particularly harmful to children, causing severe malnutrition (poor nutrition), delayed physical development, and poor cognitive function. Prompt diagnosis and treatment are important to prevent complications and reduce the spread of the disease.

Causes and Risk Factors

Giardiasis, an infection caused by the parasite giardia. The parasite attaches tightly to intestinal cells, reducing the area where nutrients can be absorbed by the body. It also negatively effects how well the intestinal brush border cells (a type of cell on the intestine wall that helps absorb nutrients) work, leading to poor absorption of nutrients, water, and electrolytes in the body. The activation of CD8+ T lymphocytes (a type of cell that kills infected cells) by the parasite's secretory/excretory products further contributes to the loss of intestinal brush border surface area.

Non-modifiable factors are factors that cannot be changed or controlled. These include:

• Increasing age
• Genetic predispositions (having a higher chance of getting a disease because of your genes or family history)
• Previous history of polyps or inflammatory bowel diseases (Crohn's disease and ulcerative colitis)

Modifiable factors are factors that can be influenced or changed. These include:

• Poor hygiene practices, especially inadequate handwashing after using the toilet or before handling food
• Drinking untreated or contaminated water from sources like streams or lakes
• Traveling to areas with poor sanitation or hygiene practices
• Close contact with infected individuals or animals

Remember, it's important to speak with your healthcare provider for personalized advice regarding treatment options and prevention strategies.

Symptoms

The most common early symptoms of giardiasis include:

• Diarrhea
• Gas
• Foul-smelling, greasy stools that tend to float
• Stomach cramps or pain
• Upset stomach or nausea
• Vomiting
• Dehydration

As giardiasis progresses or becomes more severe, other symptoms that may occur include:

• Fatigue
• Fever
• Itchy skin
• Hives
• Swelling of the eyes and joints
• Weight loss
• Difficulty absorbing nutrients like fat, lactose, vitamin A, and vitamin B12

It's important to note that some people with giardiasis may not experience any symptoms at all. If you suspect you have giardiasis or are experiencing any of these symptoms, it's best to speak with a healthcare provider for an accurate diagnosis and appropriate treatment.

Diagnosis

To diagnose giardiasis, the following examinations, tests, and procedures are commonly performed:

• Fecal microscopy examination: This is considered the gold standard method for diagnosis. It involves the microscopic identification of giardia in fecal (bowel movement) samples by detecting different stages of giardia. The sensitivity of this method depends on the technique used and the expertise of the personnel performing the examination.
• Enzyme-linked immunosorbent assay (ELISA): This immunodiagnostic test detects giardia-specific antigens in human fecal specimens.
• Antibody detection: Both cell-mediated and humoral immune responses are stimulated in giardiasis. Antibody detection tests, such as ELISA, can detect proteins made by your body to fight off an infection.
• Molecular testing: This laboratory test analyzes a sample of tissue, blood or bodily fluid to look for specific genetic risk factors for a certain disease. It can provide evidence of infections in the body

It's important to note that these examinations and tests should be performed by trained professionals. Additionally, the severity of giardiasis is typically determined based on symptoms and clinical evaluation rather than specific diagnostic tests.

Remember to speak with your healthcare provider for personalized advice on examinations, tests, and procedures for diagnosing and determining the stage or severity of giardiasis.

Treatment Options

The goals of treatment for giardiasis include:

• Eliminating the giardia parasite from the body
• Relieving symptoms such as diarrhea, abdominal pain, and nausea
• Preventing complications and reducing the risk of transmission to others

To achieve these goals, the following treatment options may be recommended:

• Medication: The mainstay of treatment is usually the use of medications such as azoles (e.g., metronidazole) or nitazoxanide. These medications work by killing the giardia parasite or inhibiting its growth.
• Health behavior changes: It is important to maintain good hygiene practices, such as washing hands thoroughly with soap and water, especially after using the toilet or changing diapers. Avoiding contaminated food and water sources is also crucial.
• Dietary interventions: Certain dietary changes may help alleviate symptoms and support recovery. Consuming a well-balanced diet that includes easily digestible foods and staying hydrated can be beneficial.

Remember, it is essential to speak with your healthcare provider before starting any medication or making significant changes to your diet or lifestyle. They can provide personalized advice based on your individual situation. Medication dosing (how and when medication is taken) may be affected by many factors. Check with your healthcare provider about dosing for your individual situation. Other side effects can occur. Check with your healthcare provider or read the information provided with your medication for additional side effect information.