OYSTERS AND HUMAN VIRUSES: EFFECT OF SEAWATER TURBIDITY ON POLIOVIRUS UPTAKE AND ELIMINATION12

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Abstract
The accumulation and elimination of poliovirus by the oyster, Crauostrea virginica, was determined for two different turbidity levels in a flow-through seawater system. Methods used for recovering virus from seawater and oyster samples were also tested for effectiveness and plaque enumeration reliability. In the virus accumulation phase, the data indicated that oysters subjected to low turbidity seawater (16–24 ppm) accumulated in 24 hours approximately three times as much virus (PFU/ml) as those oysters subjected to high turbidity seawater (54–77 ppm). In the virus elimination phase, the data indicated that turbidity (8–80 ppm) did not significantly influence virus elimination among the four experimental oyster groups in 24 hours. In 48 hours, no virus (<0.2 PFU/ml) was detected in any of the oyster groups. These results provide supportive evidence that under controlled environmental conditions, oysters can effectively eliminate virus in 48 hours when they are exposed to adequately and continuously flowing seawater of either low or high turbidity.

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