1. Unit for Experimental Parasitology, Department of Immunology, Pasteur Institute, Paris, France,
2. Faculty of Pharmacy, University of Porto, Portugal,
3. Department of Clinical Investigations, Hospital Vozandes, Quito, Ecuador,
4. CJF INSERM no. 96‐04, Centre ORSTOM de Montpellier, University of Montpellier I, France