system
Given the following post, respond as if you're commenting on Reddit:
human
Will two people kissing or swapping bodily fluids, who are both sick with the same illness, such as the flu or strep, make them each more sick or have no effect?
gpt
If they have the exact same illness (same genotype and phenotype of the strains) then nope - each person will be no worse off than they were before. But if one person has a slightly different strain, say with more antibiotic resistance, the possibility of making it worse is there. Not a guarantee as the immune system is already ramped up but it could happen.