👉 Lose-infection, also known as opportunistic infection, occurs when a normally harmless organism or a latent pathogen takes advantage of a weakened immune system to cause disease in a host that is otherwise healthy or has a compromised immune response. This can happen due to factors like immunosuppression from conditions such as HIV/AIDS, cancer treatments (like chemotherapy), or even certain medications. Common examples include Pneumocystis jirovecii pneumonia in immunocompromised individuals, toxoplasmosis in those with weakened immunity, and cryptococcal meningitis in people with AIDS. These infections are particularly dangerous because they exploit vulnerabilities that the body would otherwise be able to resist, leading to severe illness or even death if not promptly treated.