Rapid assay for infection in neonates
First Claim
1. A method of testing a neonate for infection, the method comprising:
- measuring neutrophil cell surface levels of CD11b in a sample from said neonate; and
comparing said cell surface levels of CD11b to an infection diagnosis threshold;
wherein cell surface levels of CD11b that exceed said infection diagnosis threshold is indicative of infection.
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Abstract
A rapid assay for infection in immunodeficient patients such as neonates or immunocompromised patients (e.g. HIV or transplant patients) allows diagnosis at initial evaluation, such that antibiotic treatment and confinement to an intensive care unit can be avoided for uninfected patients. The assay can be used for detecting bacterial, viral, or fungal colonization of the blood stream, cerebrospinal fluid (CSF), or urinary tract. The method is particularly useful for sepsis diagnosis. Polymorphonuclear leukocyte (PMN, neutrophil) CD11b (Mac-1, CR3) levels are measured by flow cytometry or laser scanning microscopy in low volume (0.1 ml) whole blood samples. A dual-laser FACS identifies neutrophils by FITC-conjugated anti-CD15 fluorescent antibodies, and identifies surface neutrophil CD11b marked with PE-conjugated anti-CD11b antibodies. Spontaneous upregulation of CD11b is prevented by handling samples at 4° C. or adding a stabilizing compound such as anti-CD14 antibody or adenosine to the samples. A kit comprises calibration markers such as CD11b-coated microspheres for calibrating the device used for analysis according to diagnosis threshold(s).
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Citations
28 Claims
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1. A method of testing a neonate for infection, the method comprising:
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measuring neutrophil cell surface levels of CD11b in a sample from said neonate; and comparing said cell surface levels of CD11b to an infection diagnosis threshold; wherein cell surface levels of CD11b that exceed said infection diagnosis threshold is indicative of infection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16, 17, 18)
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11. A method of testing a population of neonates for infection, the method comprising:
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measuring neutrophil cell surface levels of CD11b in samples from said population of neonates; determining the presence of infection in said neonates; correlating the cell surface level of CD11b to the presence of infection; wherein an infection diagnosis threshold is determined to be the cell surface level of CD11b that is present in infected samples. - View Dependent Claims (12, 13, 14, 15)
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19. A kit for testing a neonate for infection, the kit comprising:
a calibration marker for determining the infection diagnosis threshold of neutrophil expression of CD11b, wherein said calibration marker comprises the amount of CD11b that is representative of the amount of CD11b on a neutrophil from an infected sample. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
Specification