The date that would best reflect when a patient fell ill is the date when the sample was taken from the patient.
When the subjects returned their blood samples, they also returned a form on which they had recorded several variables relevant to the sample, including the time and date the sample was taken, the time the subject woke on that day, the date of their last menstrual period, and whether they were taking various medicines and supplements.
Dates ranging from about 650, when it is estimated the tree began to grow, to 1863, when Bierstadt first visited Yosemite, to 1950 when the core sample was taken, are marked on the wall.
But when a DNA sample was taken from Sean Toner, it proved not to be a match.
All volunteers took part in a return questionnaire when the postdeployment sample was taken.
The sample was taken when the Tour de France finished a daily stage in Italy last year.
At each site, 2 l water sample was taken (two replicates per site per sampling date) and were analyzed for physicochemical parameters during the sampling period.
The sample was taken on Dec. 9.
The average interval between the onset of clinical manifestations suggestive of DF and the date when blood samples were taken was 36±25 days.
Hall's involvement with the mystery began in the sacristy at Turin cathedral on the morning of April 21 1988, when radiocarbon dating samples were taken.
For each case the following timelines were determined: date of symptom onset, date of first presentation to medical care, date samples were taken for viral testing, and date of initiation of antiviral drug treatment.
