Find information on thousands of medical conditions and prescription drugs.

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...

Home
Diseases
A
B
C
D
E
Ebola hemorrhagic fever
Ebstein's anomaly
Eclampsia
Ectodermal Dysplasia
Ectopic pregnancy
Ectrodactyly
Edwards syndrome
Ehlers-Danlos syndrome
Ehrlichiosis
Eisoptrophobia
Elective mutism
Electrophobia
Elephantiasis
Ellis-Van Creveld syndrome
Emetophobia
Emphysema
Encephalitis
Encephalitis lethargica
Encephalocele
Encephalomyelitis
Encephalomyelitis, Myalgic
Endocarditis
Endocarditis, infective
Endometriosis
Endomyocardial fibrosis
Enetophobia
Enterobiasis
Eosinophilia-myalgia...
Eosinophilic fasciitis
Eosophobia
Ependymoma
Epicondylitis
Epidermolysis bullosa
Epidermolytic hyperkeratosis
Epididymitis
Epilepsy
Epiphyseal stippling...
Epistaxiophobia
EPP (erythropoietic...
Epstein barr virus...
Equinophobia
Ergophobia
Erysipelas
Erythema multiforme
Erythermalgia
Erythroblastopenia
Erythromelalgia
Erythroplakia
Erythropoietic...
Esophageal atresia
Esophageal varices
Esotropia
Essential hypertension
Essential thrombocythemia
Essential thrombocytopenia
Essential thrombocytosis
Euphobia
Evan's syndrome
Ewing's Sarcoma
Exencephaly
Exophthalmos
Exostoses
Exploding head syndrome
Hereditary Multiple...
Hereditary Multiple...
Hereditary Multiple...
Hereditary Multiple...
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Medicines

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).

Read more at Wikipedia.org


[List your site here Free!]


Update: eosinophilia-myalgia syndrome associated with ingestion of L-tryptophan - United States, through August 24, 1990
From Morbidity and Mortality Weekly Report, 8/31/90

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 deaths have been reported in patients who met the surveillance case definition and who used L-tryptophan-containing products (LTCPs).

As of August 24, CDC had received 1117 completed report forms from state and territorial health departments. Ages of patients ranged from 4 years to 85 years (median: 48 years); 1046 (94%) of the patients were non-Hispanic white, 19 (2%) were Hispanic, 12 (1%) were black, and 40 (4%) were from other or unknown racial/ethnic groups; and 930 (83%) were female. One thousand sixty-eight (96%) patients had histories of LTCP ingestion preceeding onset of symptoms. Symptom onset during or after July 1989 was reported in 946 (85%). Eight (0.7%) patients had onset on or after February 1, 1990. Three hundred sixty (32%) patients had been hospitalized for their illnesses by the time the cases were reported.

Editorial Note: On November 17, 1989, the Food and Drug Administration (FDA) recalled all dietary supplements that provided a daily dose of L-tryptophan (LT) [is greater than or equal to]100 mg. By March 22, 1990, this recall had been expanded to include all LTCPs at any dosage except some protein supplements, infant formulas and special dietary foods, and intravenous and oral solutions in which small amounts of LT are needed for nutrient fortification.

The eight EMS cases reported with onset after February 1 appear to have resulted principally from continued use of LT by some persons after the FDA recall rather than from long disease latency following cessation of LTCP exposure. One patient began use of LTCPs on March 20, 1990, and became ill 1 month later, indicating that some persons may be unaware of, or choose to ignore, the FDA recall.

National surveillance figures do not fully reflect the proportion of patients ultimately hospitalized as a result of EMS. Because each case is reported only once, information regarding hospitalization of patients requiring admission after their cases are reported is not available.

The surveillance definition for reporting EMS cases to CDC requires the presence of severe, debilitating myalgias and eosinophilia [is greater than or equal to] 1000 eisinophils per mm [3]. Recent unpublished reports indicate that this case definition may be overly restrictive for clinical purposes. Many persons may have forms of EMS that are eigher less severe or in which the constellation of clinical findings does not include the intense eosihophilia or severe myalgias intially identified as the hallmarks f epidemic EMS. Thus far, such cases have not been the object of national surveillance.

The failure of a case to meet criteria specified in the surveillance definition does not preclude a clinical diagnosis of EMS in a person who manifests other features of EMS or who has eigher a lower eosinophil count or milder myalgias. As in other diseases with multiple connective tissue manifestations, a set of clear-cut diagnostic criteria with both high sensitivity and specificity may be difficult or impossible to establish. The physician's judgment and appropriate weighing of all available information are important in the clinical diagnosis of EMS.

References

[1] Eidson M, Philen RM, Sewell CM, Vorrhees R, Kilbroune EM. L-tryptophan and eosinophiliamyalgia syndrome in New Mexico. Lancet 1990;335:645-8.

[2] CDC. Eosinophilia-myalgia syndrome -- New Mexico. MMWR 1989;38:765-7.

[3] CDC. Eosinophilia-myalgia syndrome and L-tryptophan-containing products-New Mexico, Minnesota, Oregon, and New York, 1989. MMWR 1989;38:785-8.

[4] CDC. Update: eosinophilia-myalgia syndrome associated with ingestion of L-tryptophan-United States. MMWR 1989;38:842-3.

[5] CDC. Update: eosinophilia-myalgia syndrome associated with ingestion of L-tryptophan-United States, as of January 9, 1990. MMWR 1990;39:14-5.

Reported by: State and territorial health departments. Div of Environmental Hazards and Health Effects, Center for Environmental Health and Injury Control, CDC.

COPYRIGHT 1990 U.S. Government Printing Office
COPYRIGHT 2004 Gale Group

Return to Eosinophilia-myalgia syndrome
Home Contact Resources Exchange Links ebay