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).
Thunderstorms. Because tornadoes often accompany thunderstorms, pay close attention to changing weather conditions when there is a severe thunderstorm watch or warning. A severe thunderstorm watch means severe thunderstorms are possible in your area.A severe thunderstorm warning means severe thunderstorms are occurring in your area.now how to distinguish between the siren's warnings for a tornado watch and a tornado warning. A tornado watch is issued when weather conditions favor the formation of tornadoes, for example, during a severe thunderstorm.