 
 <prompt> Wetin be di kain thing wey antigens dey fight against? Based on di previous question, 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 matter of herd immunity wey fit protect people wey dey vulnerable when plenti plenti people don get immunity from certain infections. 