Bexsero is a vaccine designed to protect against meningococcal disease, specifically caused by Neisseria meningitidis serogroup B. This disease can lead to severe infections, including meningitis and bloodstream infections, which can be life-threatening. The vaccine works by stimulating the immune system to recognize and fight the bacteria. Approved for use in various countries, Bexsero is typically recommended for adolescents and young adults, as they are at higher risk for contracting the disease. It is administered as an injection, usually given in two or three doses, depending on the age of the recipient and local health guidelines.