0 showing a negative result of a blood test for a particular antibody (= a substance in the blood that fights a disease): --
The participation rate was 54/68 (79 %) for seropositive index children and 108/165 (65 %) for seronegative index children.
The proportion seronegative for diphtheria tended to increase with age such that 42 % of individuals aged >40 years were seronegative.
The severity of illness and case-fatality ratios were observed to be more among seronegative individuals than seropositives during an epidemic.
For statistical analysis, negative and equivocal laboratory results were grouped together and classified as seronegative.
Potential detection of the seroconversion of an individual rabbit required that it be caught whilst seronegative and subsequently recaptured.
On 21 occasions (18 %), growers were seronegative, while the finishers in the subsequent sampling round were seropositive.
Fifty-four seropositive and 108 seronegative index children were included and 480 out of 548 family members contributed blood.
Remitting seronegative, symmetrical synovitis with pitting edema - 13 additional cases.
