SARS virus is a?
**Core Concept**
SARS virus is a type of coronavirus that was identified as the causative agent of Severe Acute Respiratory Syndrome (SARS) in 2003. The SARS-CoV is a member of the Coronaviridae family, which also includes other viruses that cause respiratory and gastrointestinal infections.
**Why the Correct Answer is Right**
SARS-CoV is a positive-sense, single-stranded RNA virus that is highly contagious and can cause severe respiratory and systemic symptoms, including pneumonia and acute respiratory distress syndrome (ARDS). The virus primarily infects the respiratory epithelial cells, leading to inflammation and damage to the lung tissue. The SARS-CoV utilizes the angiotensin-converting enzyme 2 (ACE2) receptor for entry into host cells, which is a key factor in its pathogenesis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because SARS virus is not a type of influenza virus. Influenza viruses are a different family of viruses that cause seasonal flu, and they are not related to the SARS-CoV.
**Option B:** This option is incorrect because SARS virus is not a type of HIV. HIV is a retrovirus that causes acquired immunodeficiency syndrome (AIDS), and it is not related to the SARS-CoV.
**Option C:** This option is incorrect because SARS virus is not a type of norovirus. Noroviruses are a family of viruses that cause gastrointestinal infections, and they are not related to the SARS-CoV.
**Clinical Pearl / High-Yield Fact**
The SARS-CoV outbreak in 2003 highlighted the importance of global surveillance and response to emerging infectious diseases. The rapid identification and characterization of the SARS-CoV helped to contain the outbreak and prevent further spread of the disease.
**Correct Answer: C. Coronavirus. SARS virus is a type of coronavirus.**