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Volume 9, Number 11—November 2003

Ebola Hemorrhagic Fever Transmission and Risk Factors of Contacts, Uganda1

Paolo Francesconi*, Zabulon Yoti†, Silvia Declich*Comments to Author , Paul Awil Onek‡, Massimo Fabiani*, Joseph Olango‡, Roberta Andraghetti*, Pierre E. Rollin§, Cyprian Opira†, Donato Greco*, and Stefania Salmaso*
Author affiliations: *Istituto Superiore di Sanità, Rome, Italy; †St. Mary’s Hospital Lacor, Gulu, Uganda; ‡Ministry of Health, Kampala, Uganda; §Centers for Diseases Control and Prevention, Atlanta, Georgia, USA

Main Article

Table 1

Definitions used in the chain of transmission of Ebola hemorrhagic fever

Classification Definition
Crude RR(95%CI)
Study patients
The three laboratory-confirmed case-patients from whom we retrospectively identified the other case-patients and their contacts
Index patients
The nine case-patients retrospectively identified from the study patients as the source of infection (including primary case-patients)
Primary case-patients
The three earliest patients for whom we were not able to identify the source of infection
Collateral case-patients
Cases generated by the index patients, or by other collateral case-patients, and identified by matching the list of contacts of these persons with the list of reported cases
Postprimary case-patients
Case-patients for whom we were able to identify the source of infection
Persons exposed to a case-patient, listed by the surveillance teams using the definition reported in the background section.
Healthy contacts Contacts in whom the disease did not develop within 21 days of the last exposure

Main Article

1This paper is dedicated to Dr. Matthew Lukwiya, Medical Superintendent of St. Mary’s Hospital Lacor, and the other health staff who contracted and died of Ebola while taking care of hospital patients.

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