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Why do some survive Ebola?

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Presentation on theme: "Why do some survive Ebola?"— Presentation transcript:

1 Why do some survive Ebola?
By A. CRIQUI R. NEMOZ Ebola virus - CRIQUI NEMOZ - December

2 Ebola virus - CRIQUI NEMOZ - December 4 2003
PRESENTATION - I Etiology Filoviridae virus (RNA-) Four subtypes Ebola virus - CRIQUI NEMOZ - December

3 Ebola infected patient
PRESENTATION - II Etiology Symptoms Fever Diarrhoea Vomiting Haemorrhage Ebola infected patient October 22, 2002 Ebola virus - CRIQUI NEMOZ - December

4 Ebola virus - CRIQUI NEMOZ - December 4 2003
PRESENTATION - III Etiology Symptoms Epidemiology Endemic zone Death rate Transmission Expression of the disease October 22, 2002 Ebola is still limited to parts of Africa Ebola virus - CRIQUI NEMOZ - December

5 Ebola virus - CRIQUI NEMOZ - December 4 2003
PRESENTATION - IV Etiology Symptoms Epidemiology Treatment Not found yet Ebola virus - CRIQUI NEMOZ - December

6 Ebola virus - CRIQUI NEMOZ - December 4 2003
VIRUS TARGETS NE LC sGP Virus EC GP Replication Macro Mono Ebola virus - CRIQUI NEMOZ - December

7 HUMORAL RESPONSE No IgG Few IgM IN SURVIVORS IN FATALITIES
EM Leroy - The lancet – Vol 355 – June 24, 2000 DEFECTIVE HUMORAL RESPONSE Ebola virus - CRIQUI NEMOZ - December

8 Baize – Nature medicine Circulating antigen load
 No effect of antigen load on IgG production Baize – Nature medicine Vol 5 #4 – April 1999 Circulating antigen load Ebola virus - CRIQUI NEMOZ - December

9 Ebola virus - CRIQUI NEMOZ - December 4 2003
CELLULAR RESPONSE IN SURVIVORS IN FATALITIES Too early Too excessive Acute phase : No T cells activated Clinical recovery : Cytotoxic cells activated T cells death Ebola virus - CRIQUI NEMOZ - December

10 APOPTOSIS Bcl-2 Apoptosis signal PBMC
BAIZE – Apoptosis vol 5 # Bcl-2 41/7 NMP (U/ml) PBMC 41/7 NMP is the evidence of apoptosis Ebola virus - CRIQUI NEMOZ - December

11 Different expressions of the disease
CONCLUSION Different immune responses Prevention of transmission Perspectives Different expressions of the disease Ebola virus - CRIQUI NEMOZ - December


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