How would it feel to have 3 foot long worms bursting out of your skin?  Guinea worm disease is a contaminated water disease.  When people drink water contaminated with Guinea worm larvae, the larvae grows inside the person's stomach, grows 2-3 feet long, then painfully bursts out of their skin.  To start things off, the Guinea worm disease is a water-borne disease, meaning that it only spreads through water in warm, moist areas.  When people drink dirty water that has Guinea worm larvae in it, the larvae grows and reproduces inside the person's abdomen, then emerges from the skin in a process that feels like fire.  To soothe the pain, people dip their limbs in water, but the dirty water only brings more larvae into their skin.  Africa has become very poverty-stricken because the disease disables people, causing them to not be able to go to work, school, or the farm.  Not being able to work causes the people to stop earning money, bringing them deeper into poverty.   The Guinea worm disease is a very sad and painful disease that affects Africa.
        While there is no cure in Africa for the Guinea worm disease, there are a lot of side effects.  There is a vaccine that can be used to cure the disease, but Africa doesn't have it because it is too expensive for the Africans to afford.  Many side effects come with this disease, one of which is blistering.  About a year after the worms emerge from the skin, a painful blister forms.  These blisters (and the disease itself) cause people to stay home from work and school and force them to stop farming.  Because of this, the family is brought deeper into poverty until the disabled person can work and make money again.  There are also other side effects of the disease itself, some of which include nausea, itchy rashes, dizziness, swelling of your skin, boils, and infections.  The infections come from all the bacteria in the air and water that gets into the hole where the worm came out.  Once you have the Guinea worm disease, you will have lots of unwanted side effects and will not be cured for a long time. 
        The Guinea worm disease has some numbers associated with it: 179,000, 4, and 2.  What do those numbers mean?  Well, let's start with 179,000.  In 1989, there were over 179,000 cases of Guinea worms all over Africa.  But since then, the number has gone down significantly- in 2014, there were only 126 cases reported.  The number 4's meaning is that as of 2014, cases of Guinea worms were only reported in 4 countries.  Ethiopia, Mali, Chad, and South Sudan are the countries that it affects because they are the countries that have the dirtiest water.  Lastly, the number 2 goes along with an "accomplishment" for the disease... The Guinea worm disease is said to be the second human disease (after Smallpox) to become extinct.  That is great news for Africa, knowing that the people won't have any more worms inside of them.  Also, this disease has been one of the biggest causes of poverty in Africa because of how it disables people for a very long time.  The Guinea worm disease has gotten so much better in Africa... It is even predicted to soon become eradicated.  Organizations like the Carter Center are traveling to Africa to help the Africans become free of Guinea worms even faster than predicted.  A cause of African poverty is almost gone!
How Guinea Worm eradication has been showing

The countries that the disease DID affect and DOES affect

How people remove guinea worms
(You wrap it around a stick and pull/roll  it out over  several weeks)

People get the Guinea Worm disease by drinking from this dirty water

A guinea worm