Antivirals — non-HIV

A 28-year-old man from Delhi presents with a 4-day history of high fever (39.8°C), severe myalgia, headache, and a petechial rash on his trunk and extremities. He reports recent travel to Rajasthan. On examination, he is alert but in distress; neck stiffness is absent. Blood culture and CSF culture are pending. A diagnosis of viral meningitis is suspected. Which antiviral agent should be initiated immediately while awaiting confirmatory testing?

Which antiviral drug acts by inhibiting viral neuraminidase and is effective against both influenza A and B?

A 32-year-old woman with primary varicella-zoster virus (VZV) infection presents with disseminated vesicular rash. Which feature best distinguishes VZV from HSV-1 in terms of antiviral drug metabolism?

A 32-year-old woman presents with a 5-day history of fever, severe headache, neck stiffness, and altered mental status. CSF analysis shows lymphocytic pleocytosis with normal glucose and protein levels. PCR for common bacterial pathogens is negative. Which investigation is most appropriate to confirm viral meningitis and identify the causative agent?

A 28-year-old man from rural Maharashtra presents with a 7-day history of fever, myalgia, and hemorrhagic manifestations (petechiae, epistaxis). Platelet count is 45,000/μL and AST is markedly elevated. Dengue IgM is negative on day 7 of illness. Which investigation is most appropriate to confirm dengue virus infection at this stage?