Schistosomiasis (also known as Bilharzia, snail fever, or Katayama fever) is caused by flatworm parasites that live in the blood vessels of the bladder and intestines. Schistosomiasis - also known as bilharzia, snail fever, or Katayama fever - is caused by flatworm parasites that live in the blood vessels of the bladder and intestines. Health Matters
A Tornado warning means A tornado has been  spotted/touched down in your alert area. You should take  cover if a tornado warning is issued for your area;  go into a cellar, or the lowest, most inner part of your house  where there are no windows (a downstairs or basement bathroom is  ideal).
What to do in event of tornado watch, warning. Editor's note: The following is advice from CNN Meteorologist Sean Morris on steps you can take when a tornado watch or a tornado warning is issued in your area. A tornado watch means that tornadoes, high winds, and hail are possible in the watch area. When a watch is issued in your area, keep abreast of the latest information by monitoring television, radio, and NOAA weather radio.