(1981). Duration of infection-derived immunity to cholera.
The Journal of Infectious Diseases. 143, pp. 818–820.
(1981). Echinococcus infections in Colombian animals.
Am. J. Trop. Med. Hyg.. 30, pp. 1263.
(1981). Echinococcus infections in Colombian animals.
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(1981). Effect of sunlight on survival of indicator bacteria in seawater.
Applied and Environmental Microbiology. 41, pp. 690–696.
(1981). Effects of moisture content on long term survival and regrowth of bacteria in wastewater sludge.
Applied and environmental microbiology. 41, pp. 1117–1122.
(1981). Effects of moisture content on long-term survival and regrowth of bacteria in wastewater sludge.
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(1981). Effects of moisture content on long-term survival and regrowth of bacteria in wastewater sludge.
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(1981). Ein Zweistufenverfahren zur Virusanreicherung aus Lösungen mit geringem Virustiter.
Journal of hygiene, epidemiology, microbiology, and immunology. 25, pp. 71–81.
(1981). Endemicity of toxoplasmosis in Costa Rica.
American Journal of Epidemiology. 113, pp. 254–269.
(1981). Environmental sanitation infection and nutritional status of infants in rural St. Lucia, West Indies.
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(1981). Epidemiology and Pathogenesis of Zoonotic Toxocariasis.
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(1981). Experimental Infection by Waterborne Enteroviruses.
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(1981). Fascioliasis in Puerto Rico: A review.
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(1981). Hatching mechanisms of nematodes.
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(1981). Helminths in the induction of cancer II. Schistosoma haematobium and bladder cancer.
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(1981). Infective dose of Campylobacter jejuni in milk.
BMJ. 282, pp. 1584.
(1981). Investigaciones sobre Pseudophyllidea (Carus, 1813) en el sur de Chile. VIII Desarrollo experimental de Diphyllobothrium dendriticum Nitzch en Larus maculipennis Lichtenstein.
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(1981). Mechanism of enteroviral inactivation by ozone.
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(1981). Morphological observation of Diphyllobothrium pacificum (Nybelin, 1931) Margolis, 1956 from fur seals, Callorhynus ursinus in Japan.
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(1981). The Norway rat as a selective chronic carrier of Leptospira icterohaemorrhagiae.
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(1981). The occurrence and significance to animal health of Leptospira, Mycobacterium, Escherichia coli, Brucella abortus and Bacillus anthracis in sewage and sewage sludges.
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(1981). Occurrence of Vibrio cholerae serotype O1 in Maryland and Louisiana estuaries.
Applied and Environmental Microbiology. 41, pp. 555–558.
(1981). One-year survey of enteroviruses, adenoviruses, and reoviruses isolated from effluent at an activated-sludge purification plant.
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(1981). Parasite ova in anaerobically digested sludge.
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(1981). Parasites in southern sludges and disinfection by standard sludge treatment.
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