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).
Report Abuse. A tornado watch means that conditions are favorable for a tornado to form. When a tornado watch is issued, you are often advised to stay tuned to your local news or weather station, just in case the watch is updated to a warning. They are preparing you for any tornado that forms. simsfan41 Â· 5 years ago.