One of the most common of thread worm is Pin-Worm. These worms are usually found in all parts of the world. They are mostly 1cm long, white in colour, very thin and thread like, belonging to the phylum, Nematoda. Just like the round worms, they also have their alimentary canal with both mouth and anus, bilaterally symmetrical and their body cavity are false (pseudocoelomates).

Life-Cycle And Mode Of Transmission.
These worms usually lays thousands of eggs just outside the anus. The infected individual mostly the children spreads the eggs of these worms to their playmates, through the means of their hands. From the hands they reaches the mouth, when the children puts their fingers carrying the eggs into their mouths. The eggs passes into the intestine and develops as it goes, while the adults lives in the appendix and large bowel. The female lays her eggs in and on the skin around the rectum, then it crawls back inside to the bowel, and the eggs are hatched out when the skin is moist and warm. This usually takes place in the night. After the eggs are been hatched, the tiny worms crawls into the rectum to develop into adults. The itching sensation brought about by this activity on the part of the worms, causes the individual to scratch him or her self. During the scratching, the individual gets the eggs into his finger nails. From the nails, the eggs gets into his food and proceed into his stomach, where they hatch into worms again.

Symptoms.
The most common symptoms of thread worms are;

• Itching, and
• Irritability during disposition.

Pin-Worm Treatment.

• Mebendazole (Oral Route)
• Adults and children 2 years of age and older—100 milligrams (mg) once a day for 1 day. Treatment may need to be repeated in 3 weeks.
• A tight-fitting cloth or pants especially in children, should be worn while sleeping to make access to the rectum difficult while sleeping thereby preventing the child from scratching the anus.
• The fingernails should be cut very short and washed, to prevent further infection.
• Caladryl ointment and vaseline should be applied to the anus, to allay the itching.
• The individual should have a cleaning bath every morning with particular attention to cleaning the anus.
• The individual should put on freshly laundered underwear every morning after bathing.

Preventions.

1. A good personal hygiene should be taught to the children, especially cutting of nails, washing of hands before eating and after visiting the toilet, refraining from putting their fingers in their mouth and regular bathing.
2. Treat the whole family at once, if one of the children is infected. To prevent spreading of the infection to the other ones.