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Natural course of lymphatic filariasis: insights from epidemiology, experimental human infections, and clinical observations Rajan TVAm J Trop Med Hyg 2005[Dec]; 73 (6): 995-8Lymphatic filariasis has been described as a "spectral disease". Analysis of the natural course of infection in nonendemic individuals as well as experimental infections of "volunteers" suggests that the filarial parasites are not inherently aggressive infectious agents. Experimental infections of humans with infective larvae result in transient, low-level microfilaremia, if at all. Nonendemic individuals with limited exposure show no evidence of persistent infection or pathology. Nonendemic individuals exposed to repeated infections show accelerated pathology. It is tempting to speculate that normal, immunocompetent residents in an endemic area show either (a) no pathology (endemic normals) because they are subject to the relatively low levels of infection or (b) chronic pathology if they are repeatedly infected. It would appear that only those individuals rendered immunologically tolerant to filarial parasites become productively infected with the filarial parasites. The intensity of transmission may underlie the differences in clinical presentation seen in diverse global pockets of endemicity.|Elephantiasis, Filarial/*epidemiology/etiology/pathology/*prevention & control/transmission[MESH]|Endemic Diseases[MESH]|Humans[MESH] |
