This guy has troubles - he banged his married neighbor up the ass - one wonders what the backstory is on that anal affair - but used a condom. Now he seems to be worried about HIV. Geez dude, you've got somebodies wife spreading her cheeks for your rubber covered dick to invade - and now you worry?
Good for a chuckle anyway….
I am 26 years old. I indulged in protected anal sex with my neighbour. She is married. Are there chances of HIV infection?
HIV/AIDS has spread into the community, so who can tell. At least, you used a condom. Wait for three months and have yourself checked. Most probably you are safe.