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Journal Article

Effects of pH, Temperature, and Salinity on Persistence of Avian Influenza Viruses in Water

D. E. Stallknecht, M. T. Kearney, S. M. Shane and P. J. Zwank
Avian Diseases
Vol. 34, No. 2 (Apr. - Jun., 1990), pp. 412-418
DOI: 10.2307/1591429
Stable URL: http://www.jstor.org/stable/1591429
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of pH, Temperature, and Salinity on Persistence of Avian Influenza Viruses in Water
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Abstract

The combined effects of water temperature, salinity, and pH on persistence of avian influenza virus (AIV) were evaluated in a model distilled-water system using three isolates from ducks sampled in Cameron Parish, Louisiana. Variables were tested within the ranges normally associated with surface water. Differences were detected between temperature (17 C and 28 C), pH (6.2, 7.2, 8.2), and salinity (0 ppt and 20 ppt), with a strong interactive effect observed between pH and salinity. Estimated persistence of infectivity for 1 × 106 mean tissue-culture infective dose of A/mottled duck/LA/38M/87 (H6N2) was longest at 17 C/0 ppt/pH 8.2 (100 days) and shortest at 28 C/20 ppt/pH 8.2 (9 days). Differences in the response to these variables were apparent between viruses. The ability of AIV to persist in surface water was also evaluated using samples collected from varied waterfowl habitats in coastal Louisiana. Observations were consistent with the model system, with duration of infectivity decreasing with increased salinity and pH. This suggests that experimental results may have application to field conditions. /// Se evaluaron los efectos combinados de temperatura, salinidad y pH del agua sobre la persistencia del virus de influenza aviar, usando como modelo un sistema de agua destilada. Se compararon tres cepas del virus aisladas de patos de la región de Cameron Parish, Louisiana, EUA. Se examinaron las variables dentro de los rangos normalmente asociados con la superficie del agua. Se detectaron diferencias en temperatura (17 C y 28 C), pH (6.2, 7.2 y 8.2), y salinidad (0 ppt y 20 ppt), observándose un fuerte efecto de interacción entre el pH y la salinidad. La persistencia de infectividad estimada para 1 × 106 DICC de la cepa A/pato moteado/LA/38M/87 (H6N2) fue más larga (100 días) a 17 C/0 ppt/pH 8.2 y más corta (9 días) a 28 C/20 ppt/pH 8.2. Las diferencias en la respuesta a estas variables fueron evidentes entre los virus. La capacidad del virus de influenza aviar para persistir en la superficie del agua fue también evaluada usando muestras recolectadas de varios habitats de aves acuáticas en la costa de Louisiana. Las observaciones fueron consecuentes con el sistema modelo ya que la infectividad disminuyó al aumentar la salinidad y el pH. Esto sugiere que los resultados experimentales pueden ser aplicables a las condiciones de campo.

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