Fewer than 5% of patients are expected to have a positive blood culture. Include all positive blood cultures even if they were unrelated to the episode of influenza.

TST-positive immunocompetent adults (persons > 14 years of age) at relatively low risk of being infected with TB and of progressing to active disease if infected may be referred to TB control physicians or clinics for consideration of treatment of LTBI. These would include (i) persons found to be TST positive on employment or post-secondary school screening but having no history of TB contact, no clinical condition that increases the risk of reactivation and a normal chest x-ray, and (ii) TST-positive immigrants from countries with high TB incidence (see the Immigrant Screening section for a definition of high TB incidence countries) having no clinical con ...[+++]dition that increases the risk of reactivation and a normal chest x-ray.

If a blood component is released to a hospital prior to obtaining HCV PCR results and if these HCV PCR results are later found to be positive, CBS will inform the hospital promptly so that the unit can be removed from inventory.

Outcomes Analyzed: - Persistence of varicella antibodies (as measured by gpELISA, titers ≥ 5 considered positive) - Lab-confirmed varicella cases occurring > 42 days post-vaccination (acute and convalescent titres were ≥200 gpELISA units/ml) Suspect case if there was a 4-fold rise between acute and convalescent samples and at least one titre was between 50 and 199 gpELISA units/ml -Vaccine Efficacy- Based on person-years at risk to calculate annual and cumulative breakthrough disease, only subjects actively followed as of March 2002 by questionnaire and/or annual blood sample contribute estimate)

Highly suspected bacterial contamination cases include those in which there are preliminary positive laboratory results (e.g. positive gram stain on blood component, preliminary positive culture results) and those in which clinical symptoms are highly suggestive of post-transfusion bacterial sepsis (e.g. shock, hypotension).

A laboratory should provide the blood smear interpretation as positive or negative with parasite quantification within 1-2 hours of the blood reception and should provide speciation within 12 hours, if this is not possible immediately.