Schistosomiasis, also known as bilharzia, is a disease caused by parasitic worms. Although the worms that cause schistosomiasis are not found in the United States, more than 200 million people are infected worldwide.In terms of impact this disease is second only to malaria as the most devastating parasitic disease.nfection with Schistosoma mansoni, S. haematobium, and S. japonicum causes illness in humans; less commonly, S. mekongi and S. intercalatum can cause disease. Although the worms that cause schistosomiasis are not found in the United States, more than 200 million people are infected worldwide.
A difficult question to answer, but the average sniper rifle in the  .300-.308 caliber can shoot anywhere between 100 and 800 yards. A  .50 caliber is estimated to effective â¦ at about 4 kilometers (2.5  miles).   US snipers are trained to engage targets at ranges up to 1000  meters.
Bolt action rifles remain in use as sniper rifles for engagements beyond 3-400 meters, for a variety of reasons. As most people can't even see a human with the naked eye at that distance, so it's moot.ovember 19, 2004, 06:33 PM. Hoping you'll forgive a rifle newbie, I'm trying to find out how rapidly a moderately skilled rifleman could fire a bolt action rifle, putting the rounds on target.