ROTA virus is diagnosed by –
**Core Concept**
Rotavirus is a major cause of severe gastroenteritis in infants and young children worldwide. The diagnosis of rotavirus infection primarily involves detecting the virus itself or its genetic material in stool samples.
**Why the Correct Answer is Right**
Rotavirus is a double-stranded RNA virus that can be detected using molecular techniques such as PCR (Polymerase Chain Reaction). This method amplifies the viral genetic material, allowing for its identification and quantification. The presence of rotavirus-specific genetic material in stool samples is a reliable indicator of infection.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while clinical symptoms like diarrhea and vomiting are common in rotavirus infections, they are not specific enough for a definitive diagnosis.
**Option B:** This option is incorrect because while rotavirus can be isolated from stool samples, culturing the virus is a time-consuming and not always reliable method for diagnosis.
**Option C:** This option is incorrect because while serological tests can detect antibodies against rotavirus, they do not provide a direct measure of current infection.
**Clinical Pearl / High-Yield Fact**
It's essential to note that rotavirus vaccination has significantly reduced the incidence of severe rotavirus gastroenteritis in many countries. The vaccine is primarily administered to infants, and its effectiveness has led to a decrease in hospitalizations and mortality due to rotavirus infection.
**Correct Answer: D. PCR**