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Overall single radial hemolysis (SRH) antibody response for serum samples collected between 2017 and 2018 (all four French regions combined). SRH titers below the clinical protection threshold (>85 mm2) are in red colors, titers above the clinical protection threshold are in light blue (85 mm2 and <154 mm2), titers above the clinical and virus shedding protection threshold (154 mm2 and above) are in blue.
