how to get the breast bacteria i can't find it or it's not in the current version ?

Did you get all the T1 pathogens? There should be 8  Tier 1 characters, not counting the main character.

If some T1 pathogens haven't appeared in the micro world, go to Lilly world and explore all unread event.

Then you can get breast bacteria in the crossbreed facility at micro world base.

i do have all 16 characters

is there the milking bacteria and rectum parasite and nipple bacteria and ovary parasite in this version ?