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 resilient and can survive outside the body for long periods. They are often studied in laboratories for their potential use in gene therapy and vaccine development. While most infections are mild, they can be more severe in individuals with weakened immune systems or underlying health conditions.