Final answer:
A systemic infection is an infection that has spread throughout the body. It can occur through breaches in the skin or mucous membranes. Examples include chickenpox and secondary infections caused by compromised immune systems or antibiotic treatment.
Step-by-step explanation:
A systemic infection, also known as a general infection, refers to an infection that has spread throughout the body. It occurs when pathogens enter the body and disseminate through the bloodstream or lymphatic system. This can happen through breaches in the skin or mucous membranes, such as wounds, bites, or breaks in the skin. Once the infection becomes systemic, it can cause symptoms and complications in various organs and tissues.
For example, the varicella-zoster virus enters the body through the respiratory system and spreads to cause chickenpox, resulting in red skin lesions. Infections like HIV and Influenzavirus can lead to secondary infections by opportunistic pathogens, taking advantage of compromised immune systems. Antibiotic therapy for a primary infection can also create opportunities for secondary infections.