Rotavirus testing primarily involves detecting viral antigens, nucleic acids, or viral particles in fecal samples. Common methods include colloidal gold antigen detection, PCR nucleic acid detection, and electron microscopy. The specific method should be chosen based on clinical symptoms and laboratory conditions.
Common Detection Methods
Colloidal Gold Antigen Detection (Rapid Detection)
Principle: This method uses a colloidal gold test strip labeled with specific antibodies to identify rotavirus antigens in feces.
Procedure: A small amount of fecal sample is mixed with a diluent and added to the test strip. The result is determined by the color bands (positive results show two bands) after 15-30 minutes.
Advantages: Rapid, simple to operate, and low cost; suitable for outpatient clinics or primary healthcare institutions.
Limitations: Low sensitivity (approximately 80-90%); false negatives may occur; unable to distinguish viral subtypes.
PCR Nucleic Acid Detection
Principle: Detection is achieved by amplifying rotavirus-specific gene fragments (such as VP6 and VP7 genes).
Procedure: Viral RNA is extracted from feces, reverse transcribed into cDNA, and then amplified by PCR. Results are analyzed by electrophoresis or fluorescent probes.
Advantages: High sensitivity (near 100%), can distinguish viral subtypes (e.g., G, P), suitable for epidemiological studies.
Limitations: Requires specialized equipment and technicians; high cost; long processing time (approximately 4-6 hours).
Enzyme-Linked Immunosorbent Assay (ELISA)
Principle: Utilizes enzyme-labeled antibodies to bind to viral antigens, quantifying detection through a colorimetric reaction.
Applicable Scenarios: Batch sample screening or research scenarios.
Electron Microscopy Observation
Principle: Directly observes rotavirus particles (typically "wheel-shaped") in fecal samples.
Limitations: Expensive equipment, complex operation; rarely used clinically.
