Flaviviruses are a group of viruses belonging to the family Flaviviridae. They are primarily transmitted to humans through the bites of infected mosquitoes and ticks. Some well-known flaviviruses include Dengue virus, Zika virus, and West Nile virus. These viruses can cause various diseases, ranging from mild fevers to severe neurological disorders. Flaviviruses are single-stranded RNA viruses, meaning their genetic material consists of a single strand of ribonucleic acid. They replicate within host cells, leading to the production of new virus particles. Vaccines are available for some flavivirus diseases, such as Yellow fever, helping to prevent outbreaks and protect public health.