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MINAMATA DISEASE By: Fathimath Suooda
HISTORY OF OCCURRENCE OF
MINAMATA DISEASE
•Minamata is a small town facing
Shiranui sea in Kumamoto
Perfecture on Kyushu Island in
southern Japan.
•1956 Spring a 5 year old girl was
found with neurological symptoms.
She had convulsions and difficulty
in speaking and walking.
She was the first well documented
case of Minamata disease and was
officially reported with 3 other
cases including her sister on May
1st 1956.
Minamata disease sometimes
FINDING THE CAUSE
•Reseachers from Kumamoto University found
the staple food od victims was invariably fish
and shellfish from manamata bay.
•The cats in the local area which tended to eat
scarps from under the tables died with
similar symptoms those in dying humans.
•The led researches to believe that outbreak
was caused by some kind of food poisoning
with fish and shellfish.
•November 4th 1956 researches officially
informed that initial findings : “Minamata
disease is rather considered to be poisoning
by heavy metal presumably enters human
body mainly through fish and shellfish”.
CHISSO CORPORATION’S CHEMICAL
FACTORY
•It was caused by the release of methylmercury in
the industrial wastewater from the Chisso
Corporation’s chemical factory, which continued
from 1932 to 1968.
•This highly toxic chemical bioaccumulated and
biomagnified in shellfish and fish in Minamata
Bay and the Shiranui Sea, which, when eaten by
the local population, resulted in mercury
poisoning.
•Minamata disease has not been confined to
Minamata where the source of the mercury was
primarily from eating fish caught in the
contaminated Bay.
•Other sources of maternal exposure to methyl
mercury have included flour made from seed
grain treated with methyl mercury (which affected
WHAT IS MINAMATA DISEASE?
Minamata disease is a
methylmercury poisoning associated
with daily consumption of large
quantities of fish and shellfish
heavily contaminated with the toxic
chemical.
The disease shows variety of clinical
symptoms depending on the
exposure level to chemical.
When its Sever its knows as Hunter-
Russell syndrome.
SIGNS AND SYMPTOMS OF
MINAMATA DISEASE
• Ataxia (lack of muscle
coordination on voluntary
movements)
• Numbness in hands and feet
• Loss of peripheral vision
• Damage to hearing and
speech
• In extreme cases, insanity,
paralysis, coma, and death
follow within weeks of the
onset of symptoms.
• A congenital form of the
TREATMENT OF MINAMATA
•No fundamental cure for manamata disease yet been discovered
so treatment includes helping the patient with the painful
symptoms.
•The most important aspect is the removal of mercury from the
body using chelating agents.
•Physical rehabilitation for the patients with loss of muscle
function and paralysis this helps some patients to regain little
amount of control over mobility.
•In some cases patients suffer form convulsions in which case
doctors will give anticonvulsant drugs.
REFERENCE:
https://www.timetoast.com/timelines/minamata-disease
Originally published
at https://biomedicalscience2024.blogspot.com on June 7, 2020.
http://www.med.or.jp/english/pdf/2006_03/112_118.pdf
https://www.sciencedirect.com/topics/nursing-and-health-
professions/minamata-disease

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Minamata illness

  • 1. MINAMATA DISEASE By: Fathimath Suooda
  • 2. HISTORY OF OCCURRENCE OF MINAMATA DISEASE •Minamata is a small town facing Shiranui sea in Kumamoto Perfecture on Kyushu Island in southern Japan. •1956 Spring a 5 year old girl was found with neurological symptoms. She had convulsions and difficulty in speaking and walking. She was the first well documented case of Minamata disease and was officially reported with 3 other cases including her sister on May 1st 1956. Minamata disease sometimes
  • 3. FINDING THE CAUSE •Reseachers from Kumamoto University found the staple food od victims was invariably fish and shellfish from manamata bay. •The cats in the local area which tended to eat scarps from under the tables died with similar symptoms those in dying humans. •The led researches to believe that outbreak was caused by some kind of food poisoning with fish and shellfish. •November 4th 1956 researches officially informed that initial findings : “Minamata disease is rather considered to be poisoning by heavy metal presumably enters human body mainly through fish and shellfish”.
  • 4. CHISSO CORPORATION’S CHEMICAL FACTORY •It was caused by the release of methylmercury in the industrial wastewater from the Chisso Corporation’s chemical factory, which continued from 1932 to 1968. •This highly toxic chemical bioaccumulated and biomagnified in shellfish and fish in Minamata Bay and the Shiranui Sea, which, when eaten by the local population, resulted in mercury poisoning. •Minamata disease has not been confined to Minamata where the source of the mercury was primarily from eating fish caught in the contaminated Bay. •Other sources of maternal exposure to methyl mercury have included flour made from seed grain treated with methyl mercury (which affected
  • 5. WHAT IS MINAMATA DISEASE? Minamata disease is a methylmercury poisoning associated with daily consumption of large quantities of fish and shellfish heavily contaminated with the toxic chemical. The disease shows variety of clinical symptoms depending on the exposure level to chemical. When its Sever its knows as Hunter- Russell syndrome.
  • 6. SIGNS AND SYMPTOMS OF MINAMATA DISEASE • Ataxia (lack of muscle coordination on voluntary movements) • Numbness in hands and feet • Loss of peripheral vision • Damage to hearing and speech • In extreme cases, insanity, paralysis, coma, and death follow within weeks of the onset of symptoms. • A congenital form of the
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  • 8. TREATMENT OF MINAMATA •No fundamental cure for manamata disease yet been discovered so treatment includes helping the patient with the painful symptoms. •The most important aspect is the removal of mercury from the body using chelating agents. •Physical rehabilitation for the patients with loss of muscle function and paralysis this helps some patients to regain little amount of control over mobility. •In some cases patients suffer form convulsions in which case doctors will give anticonvulsant drugs.
  • 9. REFERENCE: https://www.timetoast.com/timelines/minamata-disease Originally published at https://biomedicalscience2024.blogspot.com on June 7, 2020. http://www.med.or.jp/english/pdf/2006_03/112_118.pdf https://www.sciencedirect.com/topics/nursing-and-health- professions/minamata-disease