1. Scherer, W.F. Personal communication. 2. Shope, R.E. Personal communication. 3. Davalos, A. Mata Inst. Salubridad. Enfermedades, Tropicales, Mexico D.F. Personal communication. 4. Scherer, W.F. Personal communication. 1976. 5. Calisher, C.H., et al. 1983. Am. J. Trop. Med. Hyg. 32:877-885.
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