Parasites that affect the small intestine and lungs
Cause of Infection
Necator americanus
Ancylostoma duodenale
Transmission of disease
1. Walks barefoot on soil that contains the larvae
2. Swallows soil particles, for example on unwashed salad leaves
The eggs of these hookworms end up on the ground after passing through human feces. They hatch into larvae which stays in the soil
Humans contract hookworm larvae found in dirt contaminated by feces. The larvae enter your skin, travel through your bloodstream, and enter your lungs. They are carried to your small intestine when you cough them out of the lung and swallow
Fully grown, they can live in your small intestine for a year or more before passing through your feces
Carriers of infection
https://www.healthline.com/health/hookworm#causes
Symptoms
Itchiness and a rash where the larvae entered your skin
Diarrhea as the hookworms grow in your intestine
Abdominal pain
Colic, or cramping and excessive crying in infants
Intestinal cramps
Nausea
A fever
Blood in your stool
A loss of appetite
Itchy rash
Treatment
A doctor will normally recommend taking certain medications — albendazole, mebendazole, or pyrantel pamoate — for 1 to 3 days to treat the parasitic infection
Antihelminthics
Anti-parasitic drugs
Those with severe anemia may need iron supplementation
In places where hookworm is common, those who are at risk may receive preventive drug treatment to protect them from an infection
Prevention
Wearing shoes, especially in soiled areas with a high risk of contamination
Using a barrier to prevent the skin from touching the soil when sitting on the ground
Avoiding consuming soil or unwashed foods that may be contaminated with hookworm
Not passing stool in the soil or outdoors
Not using fertilizer made from human feces
Covering children's sandboxes
Taking safety precautions, such as wearing gloves and shoes when gardening
Treating pet dogs and cats for hookworm
ASCARIASIS
Occurs when a type of roundworm known as ascaris lumbricoides infects the small intestine
Symptoms
Abdominal pain
Vomiting
Loss of appetite
Transmission
A soil transmitted helminth
The roundworm lays eggs, which then pass in the person's stool, or poop. It can spread when an infected person defecates near farmland or crops
When people do not wash crops or cook them thoroughly, the roundworm can enter a new host, and start its life cycle again
Many people with ascariasis do not experience any symptoms until the infection has become severe
Ascariasis worms
Typically pink or white with tapered ends
Female worms can be more than 15 inches (40 centimeters) long and a little less than a quarter inch (6 millimeters) in diameter
Male worms are generally smaller
Symptoms
Abdominal pain or discomfort
Weight loss
Loss of appetite
Nausea
Worms visible in stool
Diarrhea
Vomiting
Irregular bowel movements
Impaired growth in children
Fever
Bloody mucus
Discomfort in the chest
Shortness of breath
Gagging cough
Wheezing
Life cycle of Ascaris lumbricoides
1. Ingestion
2. Migration
3. Maturation
4. Reproduction
Mild cases of ascariasis usually don't cause complications
Complications
Slowed growth
Intestinal blockage and perforation
Duct blockages
Prevention
Practice good hygiene. Before handling food, always wash your hands with soap and water. Wash fresh fruits and vegetables thoroughly.
Use care when traveling. Use only bottled water, and avoid raw vegetables unless you can peel and wash them.
Taeniasis
Intestinal infection with tapeworms
Parasite species that cause taeniasis in humans
Taenia solium
Taenia saginata
Taenia asiatica
Only T. solium causes major health problems
Other names for taeniasis
Taenia saginata (beef tapeworm)
Taenia solium (pork tapeworm)
Symptoms
Pain
Unexplained weight loss
Blockage of the intestine
Digestive problems
Irritation in the perianal area
People often become aware that they have a tapeworm when they see worm segments or eggs in their stool
Infections can take between 8 and 14 weeks to develop
Causes
Eating raw or undercooked beef or pork. Contaminated food can contain tapeworm eggs or larvae that grow in your intestines when eaten
Fully cooking beef or pork will destroy the larvae so that they can't live in your body
The tapeworm can grow up to 12 feet in length. It can live in the intestines for years without being discovered
Poor hygiene can also cause the spread of taeniasis. Once tapeworm larvae are in human stool, they can be spread through contact with the stool
Life cycle
Not provided
Prevention
Cook meat to safe temperatures. Use a food thermometer to measure the internal temperature of cooked meat. Do not sample meat until it is cooked.
Treatment
Taeniasis can be treated with single doses of praziquantel (10 mg/kg) or niclosamide (adults and children over 6 years: 2 g, children aged 2–6 years: 1 g). Albendazole at 400 mg for 3 consecutive days has also been used.
Toxocariasis
Infection with larvae of Toxocara spp., which are common ascarid roundworms of mammals