Volume 9, Number 11—November 2003
Research
Ebola Hemorrhagic Fever Transmission and Risk Factors of Contacts, Uganda1
Paolo Francesconi*, Zabulon Yoti†, Silvia Declich*
, Paul Awil Onek‡, Massimo Fabiani*, Joseph Olango‡, Roberta Andraghetti*, Pierre E. Rollin§, Cyprian Opira†, Donato Greco*, and Stefania Salmaso*
, Paul Awil Onek‡, Massimo Fabiani*, Joseph Olango‡, Roberta Andraghetti*, Pierre E. Rollin§, Cyprian Opira†, Donato Greco*, and Stefania Salmaso*Table 1
Definitions used in the chain of transmission of Ebola hemorrhagic fever
| Classification | Definition Crude RR(95%CI) P-value |
|---|---|
| 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 |
| Contacts |
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 |
