TABLE 1.

Summary of statistics for V. parahaemolyticus and V. vulnificus densities in the Mississippi Sound and Dauphin Islanda

SampleSampling periodNo. of samplesProbeRange of no. of CFU/ml or g for respective DP/CH probe (median)No. of DP/CH detects/total no. of samples (%)No. of DP/CH + MPN detects/total no. of samples (%)Range of SST (°C) (median)Range of Chl (μg/liter) (median)Range of Turb (NTU) (median)Range of salinity (ppt) (median)Mean of log vibrios/g or mlbSD of log vibrios/g or mlb
WaterFeb. 2006-Aug. 2007115vvh<1->250 (1)70/115 (61)NA9-34 (21)1-275 (8)0-47 (7)3-35 (22)0.14 (−0.036, 0.32)0.89 (0.75, 1.1)
tlh<1-132 (<1)56/115 (49)82/115 (71)−0.34 (−0.54, −0.15)1.3 (1.2, 1.5)
tdh<1-2 (<1)9/115 (8)55/115 (48)−3.6 (−4.5, −2.7)3.5 (2.8, 4.5)
trh<1-4 (<1)3/115 (3)36/115 (31)−4.2 (−4.8, −3.6)2.2 (1.9, 2.4)
OystersMar. 2006-Aug. 200770vvh<10-2,555 (368)61/70 (87)NA9-34 (26)1-20 (7)1-47 (8)9-32 (24)2.2 (2, 2.4)0.84 (0.68, 1)
tlh<10-2,791 (236)61/70 (87)66/70 (94)2 (1.7, 2.2)0.96 (0.8, 1.2)
tdh<10-36 (<10)14/70 (20)49/70 (70)−0.9 (−1.3, −0.52)1.4 (1.1, 1.8)
trh<10-36 (<10)12/70 (17)42/70 (60)−1.5 (−2, −1)1.5 (1.1, 2)
SedimentJuly 2006-Aug. 200754vvh<100-13,800 (367)44/54 (81)NA9-34 (26)1-20 (7)1-29 (8)9-32 (24)2.5 (2.2, 2.8)0.86 (0.67, 1.1)
tlh<20->25,000 (1,408)51/54 (94)NA3 (2.8, 3.3)0.87 (0.7, 1.1)
tdh<20-467 (<20)22/54 (41)NA0.79 (0.35, 1.2)0.96 (0.65, 1.4)
trh<20-483 (<20)20/54 (37)NA0.6 (0.048, 1.1)1 (0.67, 1.6)
  • a tlh, thermolabile hemolysin gene; tdh, thermostable direct hemolysin gene; trh, tdh-related hemolysin gene; vvh, V. vulnificus hemolysin gene; NA, not applicable; SST, sea surface temperature; Chl, chlorophyll a; Turb, turbidity; NTU, nephelometric turbidity units; ppt, parts per thousand; DP/CH, direct plating/colony hybridization; MPN, most probable number. Data for numbers of CFU/ml and CFU/g are from DP/CH. Data for percent detects are from combined DP/CH and MPN/PCR data for water and oysters and from DP/CH for sediment; no MPN/PCR was carried out for vvh or for sediment samples.

  • b Mean and standard deviation of number of log10 CFU/ml or CFU/g estimated by GLMM (best estimate, 95% confidence interval).