What typically is the most common cause of aseptic meningitis?

Aseptic meningitis is primarily characterized by the absence of bacterial pathogens in the cerebrospinal fluid, and viral infections are the most prevalent cause of this condition. Enteroviruses, in particular, are frequently responsible for cases of viral meningitis, especially in children and young adults. These viruses are typically spread through the fecal-oral route, and outbreaks are more common in summer and fall months.

Viral meningitis often runs a milder course compared to bacterial meningitis and generally resolves without specific antiviral treatment. It is important to recognize the clinical distinction, as prompt identification of bacterial meningitis is critical for initiating appropriate antibiotic therapy, which is not necessary for aseptic meningitis.

Other causes, such as fungal and parasitic infections, are much less common in causing aseptic meningitis. Bacterial infections, while a significant cause of meningitis overall, would lead to a diagnosis of bacterial meningitis, which is characterized by a specific clinical picture and findings in the cerebrospinal fluid. Thus, the predominant cause of aseptic meningitis is indeed viral, with enteroviruses being the most notable contributors.