👉 Quick infection, also known as rapid onset infection, refers to a condition where an individual develops symptoms of an illness or infection very quickly, often within hours or days after exposure to a pathogen. This rapid progression is typically due to the high virulence of the microorganism, its ability to evade the immune system, or direct damage to host tissues. Unlike slow-onset infections, which develop gradually over weeks or months, quick infections can be severe and require immediate medical attention to prevent complications. Common causes include highly contagious viruses like influenza or norovirus, and bacteria such as Streptococcus pneumoniae, which can spread easily in crowded environments.