Virus surveillance refers to the systematic monitoring and tracking of viruses in various environments, such as human populations, animal populations, and the environment. This includes the collection, analysis, and interpretation of data on the presence, spread, and impact of viruses in order to inform public health interventions and strategies. Virus surveillance is crucial for early detection of emerging infectious diseases, monitoring of disease trends, and identification of potential outbreaks. It involves the use of various laboratory techniques, such as molecular testing and sequencing, as well as epidemiological and statistical methods to track and understand the behavior of viruses. Overall, virus surveillance plays a key role in public health efforts to prevent and control the spread of viral diseases, as well as in ensuring preparedness for future health threats.