 
 <prompt> Wetin immune systems dey face wen infection show face? Based on di question wey dey above, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Resistance to infection (immunity) fit dey happen after person don get disease, by dey carry de pathogen without dey show symptoms, by dey carry organism wey get similar structure (crossreacting), or by vaccination. We sabi more about the antigens wey dey protect and specific immune factors wey person don acquire for primary pathogens pass for opportunistic pathogens. There dey also the thing wey dem dey call herd immunity wey fit protect people wey dey vulnerable when plenty people for population don get immunity from some infections. 