Adenoviruses are a group of common viruses that can cause a variety of illnesses in humans. They are known to lead to respiratory infections, conjunctivitis (pink eye), and gastrointestinal issues. These viruses are highly contagious and can spread through respiratory droplets, direct contact, or contaminated surfaces. Adenoviruses are particularly notable for their ability to survive outside the body for extended periods, making them resilient in various environments. While most infections are mild and self-limiting, they can be more severe in individuals with weakened immune systems. Vaccines are available for certain types, primarily for military personnel.