Viral diseases

Viral diseases are illnesses caused by viruses, which are tiny infectious agents that can only reproduce inside living cells. Unlike bacteria, viruses are not alive on their own and need a host to survive. Common viral diseases include the flu, COVID-19, and HIV/AIDS. They can spread through various means, such as respiratory droplets, direct contact, or contaminated surfaces. Symptoms vary widely but may include fever, fatigue, and respiratory issues. Vaccines and antiviral medications can help prevent or treat some viral infections, highlighting the importance of public health measures in managing these diseases.