Context: An outbreak of secret disease among injecting Drug users distinguished by the injection site inflammation and harsh complete toxicity happened in Ireland and the United Kingdom from April to August 2000. One hundred eight persons became ill, and 43 persons died. In Dublin, 8 of 22 patients died. Six of the 8 fatal cases were epidemiologically linked to a source of heroin. Most had experienced local injection site lesions for 7 to 14 days before developing a rapidly fatal systemic illness characterized by hypotension, thirst, pulmonary edema, pericardial and pleural effusions, and leukocytosis.
Objective: To document the clinical course and autopsy findings of the fatal cases in Dublin.
Design: To study the clinical, autopsy, microbiologic, and toxicologic findings from the 8 fatal cases in Dublin.
Results: In Dublin, there were 6 men and 2 women who were fatally involved in the epidemic, with the mean age being 34 years (range, 22-51 years). The injection site inflammations involved the buttock (n = 4), leg, iliac region, arm, and a Portacath site. At autopsy, the local lesions were ulcerated, swollen, and indurated but were inconspicuous in 2 patients. All the deceased had pulmonary edema. There were pleural effusions in 7, 2 of whom had pericardial effusions. Five had prominent left ventricular subendocardial hemorrhages. Five had splenomegaly. Microscopy showed pulmonary edema and a granulocytic reaction mainly in the spleen, marrow, and myocardium. Toxicology showed a range of narcotic drugs in the toxic or fatal range. Clostridium novyi type A, a fastidious toxin-producing anaerobe, was identified in 2 cases.
Conclusion: The clinicopathologic findings of a local inflammatory lesion followed 7 to 14 days later by a rapidly fatal systemic illness are consistent with the effect of exotoxin produced by organisms growing in the local inflammatory site. Clostridium novyi-derived exotoxin is the likely cause of such a syndrome, although the fastidious organism was isolated from only 2 of 8 cases (from none of the 14 surviving patients and from only 13 of 60 cases in Scotland). In the setting of an epidemic, the toxic and fatal range blood levels of Narcotics are unlikely to explain these events, and no other candidate organism could be isolated. The origin of Heroin is likely from Afghanistan, but neighboring contamination at a reputed distribution site is to be the initiating factor in the United Kingdom is more likely than international terrorism.
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