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Eosinophilia-myalgia syndrome

Eosinophilia-myalgia syndrome is an incurable and sometimes fatal flu-like neurological condition that was caused by contaminated L-tryptophan supplements. Similar to regular eosinophilia, it causes an increase in eosinophil granulocytes in the patient's blood. more...

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In 1989 an outbreak of eosinophilia-myalgia syndrome was traced to an improperly prepared batch of tryptophan. The bacterial culture used to synthesise tryptophan had recently been genetically engineered to increase tryptophan production: unfortunately, with the higher tryptophan concentration in the culture medium, the purification process had also been modified to reduce costs, and a purification step that used charcoal absorption to remove impurities had been modified so that reduced amounts of charcoal were used. It is possible that one or more of these modifications allowed new or greater impurities through the purification. The specific impurity (or impurities) responsible for the toxic effects is still equivocal, although several impurities have been associated with the disease, and their chemical structures determined. Regardless of the origin of the toxicity, tryptophan was banned from sale in the US, and other countries followed suit. In February 2001, the FDA loosened the restrictions on the marketing of tryptophan (though not on importation).

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Eosinophilia-myalgia syndrome and L-tryptophan-containing products - New Mexico, Minnesota, Oregon, and New York, 1989. : An article from: Morbidity and Mortality Weekly Report $5.95 POSSIBLE LINK FOUND BETWEEN SUPPLEMENTS AND SERIOUS ILLNESS. : An article from: NCAHF Newsletter $5.95
Update: eosinophilia-myalgia syndrome associated with ingestion of L-tryptophan - United States. : An article from: Morbidity and Mortality Weekly Report $5.95 RHE1 It is not nice to fool with mother: Nature; Case of the herbal-induced rash. (RHeumatology).(Brief Article) : An article from: Southern Medical Journal $5.95
L-Tryptophan: Current Prospects in Medicine and Drug Safety $91.60

Pulmonary involvement in the eosinophilia-myalgia syndrome
An epidemic of eosinophilia and myalgia occurred in late 1989; it has been called the eosinophilia-myalgia syndrome. The symptoms of this syndrome include ...
Eosinophilia-myalgia syndrome - review of patients' medical records - Tips from Other Journals
The eosinophilia-myalgia syndrome is characterized by myalgia, fatigue, arthralgia, peripheral edema, rash and eosinophilia and is associated with ingestion ...
Eosinophilia-myalgia syndrome - Tips from Other Journals
Eosinophilia and myalgia rarely coexist, except in cases of trichinosis, eosinophilic fasciitis, eosinophilic myositis, Churg-Strauss syndrome, hypereosinophilic ...
Eosinophilia-myalgia syndrome: follow-up survey of patients - New York, 1990-1991
As of December 1, 1990, 151 cases of eosinophilia-myalgia syndrome (EMS)* had been reported to the New York State Department of Health (NYSDOH); 10 ...
Update: eosinophilia-myalgia syndrome associated with ingestion of L-tryptophan - United States, as of January 9, 1990
Update: Eosinophilia-Myalgia Syndrome Associated with Ingestion of L-Tryptophan - United States, as of January 9, 1990 As of January 9, 1046 eosinophilia-myalgia ...
Clinical spectrum of eosinophilia-myalgia syndrome - California
Clinical Spectrum of Eosinophilia-Myalgia Syndrome -- California As of January 12, 1990, 210 eosinophilia-myalgia syndrome (EMS) cases [1,2] had been ...
Update: eosinophilia-myalgia syndrome associated with ingestion of L-tryptophan - United States
Update: Eosinophilia-Myalgia Syndrome Associated with Ingestion of L-Tryptophan -- United States On November 9, 1989, CDC contacted all state health ...
Update: eosinophilia-myalgia syndrome associated with ingestion of L-tryptophan - United States, through August 24, 1990
As of August 24, 1990, 1536 cases of eosinophilia-myalgia syndrome (EMS) had been reported to CDC from all 50 states, the District of Columbia, and Puerto Rico (Figure 1) (1-5). Twenty-seven death

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