Garcia et al listed criteria for superinfection of an hydatid cyst by other micro-organisms. The authors are from Hospital Universitario de Salamanca and Hospital General de Segovia in Spain.
Requirement: aspiration or drainage of purulent material from an hydatid cyst
Criteria for definitive diagnosis of superinfection - one or both of the following:
(1) positive culture or other definitive evidence of a bacterial or fungal pathogen
(2) positive blood cultures
Criteria for a probable diagnosis - one of the following:
(1) clinical evidence of a systemic inflammatory response
(2) radiologic changes in the cyst indicative of infection
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